英语词汇“sac”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

1n 2n 3n

A sac is a hollow space or container. While any pocket or pouch can be called a sac, the word usually refers to a small enclosed space that occurs in nature, like a spider's egg sac or a squid's ink sac.

You might put your groceries in a sack, but without the “k” a sac is smaller and attached to a plant or animal. Human fetuses grow inside an amniotic sac, and seed plants produce pollen inside sacs as well. Since the mid-1700s, sac has been used to mean "biological pocket," from the Latin root word saccus, or "bag." If you’re not sure which sac to use, it’s almost always the other one unless you’re in biology class.

CHOOSE YOUR WORDS

sac / sack

Both are containers, but a sac is for plants and animals, and a sack is for a sandwich. So spiders put their eggs in a sac, and people put their groceries in a sack.

A sac is usually biological — attached to a living thing. At the end of E.B. White's, Charlotte's Web, Charlotte, the dying spider, says, "This is my egg sac, my magnum opus, my great work."

Sacs aren't just for spiders, though. Humans have them, too:

"The identical twin girls shared an amniotic sac and placenta." (Washington Post)

"It damages air sacs and passages to the lungs, and can make breathing a struggle." (BBC)

Add a "k" to make sack and you've got yourself another name for a bag you can put your groceries in. You might have a sack of flour in your kitchen. Soldiers can also sack entire villages, as in raid them. People also sack quarterbacks and needless employees. Here are some examples:

"Within earshot, Meser, a 32-year-old farmer, sat on three sacks of rice with two cans of oil resting by his feet." (New York Times)

"Attitudes hardened after the sacking of Constantinople, the centre of the Orthodox empire, by Crusaders in 1204." (The Guardian)

"Every team that passed me, I was thinking how I'm going to sack their quarterback." (Salon)

They sound exactly the same, and they both contain something, but sac is more specific and rare than sack. You put your snack in a sack.

WORD FAMILY

sac: sacs

USAGE EXAMPLES

The Spokane County Medical Examiner said Friday that Patricia Johnson died of heart failure after the sac around her heart filled with fluid.

Washington Times(Dec 30, 2016)

Illegal salvers deactivate their AIS when over a shipwreck, which registers with the SAC system.

The Guardian(Dec 20, 2016)

His fingers plunged inside the urchin and then he passed me the slimy orange sac that lurked within it.

New York Times(Aug 30, 2016)

n an enclosed space

Syn|Hyper

pocket, pouch, sack

cavity, enclosed space

space that is surrounded by something

n a case or sheath especially a pollen sac or moss capsule

Syn|Hyper

theca

cover, covering, natural covering

a natural object that covers or envelops

n a structure resembling a bag in an animal

Hypo|Hyper

yolk sac

membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo

umbilical vesicle, vesicula umbilicus, vitelline sac, yolk sac

membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional

amnion, amnios, amniotic sac

thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)

chorion

the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals)

coelenteron

the saclike body cavity of a coelenterate

air bladder, float, swim bladder

an air-filled sac near the spinal column in many fishes that helps maintain buoyancy

air sac

any of the membranous air-filled extensions of the lungs of birds

air sac

any of the thin-walled extensions of the tracheae of insects

saccule, sacculus

a small sac or pouch (especially the smaller chamber of the membranous labyrinth)

bladder, vesica

a distensible membranous sac (usually containing liquid or gas)

acinus

one of the small sacs or saclike dilations in a compound gland

bursa

a small fluid-filled sac located between movable parts of the body especially at joints

cistern, cisterna

a sac or cavity containing fluid especially lymph or cerebrospinal fluid

pocket, pouch

(anatomy) saclike structure in any of various animals (as a marsupial or gopher or pelican)

cyst, vesicle

a small anatomically normal sac or bladderlike structure (especially one containing fluid)

air cell, air sac, alveolus

a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways

pericardial sac

the membrane surrounding the heart

gastric mill, gizzard, ventriculus

thick-walled muscular pouch below the crop in many birds and reptiles for grinding food

utricle, utriculus

a small pouch into which the semicircular canals open

dacryocyst, lacrimal sac, tear sac

either of the two dilated ends of the lacrimal ducts at the nasal ends of the eyes that fill with tears secreted by the lacrimal glands

gall bladder, gallbladder

a muscular sac attached to the liver that stores bile (secreted by the liver) until it is needed for digestion

atrial auricle, auricle, auricula atrii

a small conical pouch projecting from the upper anterior part of each atrium of the heart

auricula, auricular appendage, auricular appendix

a pouch projecting from the top front of each atrium of the heart

Golgi apparatus, Golgi body, Golgi complex, dictyosome

a netlike structure in the cytoplasm of animal cells (especially in those cells that produce secretions)

urinary bladder

a membranous sac for temporary retention of urine

cheek pouch

a membranous pouch inside the mouth of many rodents (as a gopher)

marsupium

an external abdominal pouch in most marsupials where newborn offspring are suckled

scrotum

the external pouch that contains the testes

bleb, blister, bulla

(pathology) an elevation of the skin filled with serous fluid

follicle

any small spherical group of cells containing a cavity

liposome

an artificially made microscopic vesicle into which nucleic acids can be packaged; used in molecular biology as a transducing vector

bodily cavity, cavity, cavum

(anatomy) a natural hollow or sinus within the body

单词	sac
释义	sac (once / 7558 pages) 1n 2n 3n A sac is a hollow space or container. While any pocket or pouch can be called a sac, the word usually refers to a small enclosed space that occurs in nature, like a spider's egg sac or a squid's ink sac. You might put your groceries in a sack, but without the “k” a sac is smaller and attached to a plant or animal. Human fetuses grow inside an amniotic sac, and seed plants produce pollen inside sacs as well. Since the mid-1700s, sac has been used to mean "biological pocket," from the Latin root word saccus, or "bag." If you’re not sure which sac to use, it’s almost always the other one unless you’re in biology class. CHOOSE YOUR WORDS sac / sack Both are containers, but a sac is for plants and animals, and a sack is for a sandwich. So spiders put their eggs in a sac, and people put their groceries in a sack. A sac is usually biological — attached to a living thing. At the end of E.B. White's, Charlotte's Web, Charlotte, the dying spider, says, "This is my egg sac, my magnum opus, my great work." Sacs aren't just for spiders, though. Humans have them, too: "The identical twin girls shared an amniotic sac and placenta." (Washington Post) "It damages air sacs and passages to the lungs, and can make breathing a struggle." (BBC) Add a "k" to make sack and you've got yourself another name for a bag you can put your groceries in. You might have a sack of flour in your kitchen. Soldiers can also sack entire villages, as in raid them. People also sack quarterbacks and needless employees. Here are some examples: "Within earshot, Meser, a 32-year-old farmer, sat on three sacks of rice with two cans of oil resting by his feet." (New York Times) "Attitudes hardened after the sacking of Constantinople, the centre of the Orthodox empire, by Crusaders in 1204." (The Guardian) "Every team that passed me, I was thinking how I'm going to sack their quarterback." (Salon) They sound exactly the same, and they both contain something, but sac is more specific and rare than sack. You put your snack in a sack. WORD FAMILY sac: sacs USAGE EXAMPLES The Spokane County Medical Examiner said Friday that Patricia Johnson died of heart failure after the sac around her heart filled with fluid. Washington Times(Dec 30, 2016) Illegal salvers deactivate their AIS when over a shipwreck, which registers with the SAC system. The Guardian(Dec 20, 2016) His fingers plunged inside the urchin and then he passed me the slimy orange sac that lurked within it. New York Times(Aug 30, 2016) 1 n an enclosed space Syn\|Hyper pocket, pouch, sack cavity, enclosed space space that is surrounded by something 2 n a case or sheath especially a pollen sac or moss capsule Syn\|Hyper theca cover, covering, natural covering a natural object that covers or envelops 3 n a structure resembling a bag in an animal Hypo\|Hyper yolk sac membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo umbilical vesicle, vesicula umbilicus, vitelline sac, yolk sac membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional amnion, amnios, amniotic sac thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) chorion the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals) coelenteron the saclike body cavity of a coelenterate air bladder, float, swim bladder an air-filled sac near the spinal column in many fishes that helps maintain buoyancy air sac any of the membranous air-filled extensions of the lungs of birds air sac any of the thin-walled extensions of the tracheae of insects saccule, sacculus a small sac or pouch (especially the smaller chamber of the membranous labyrinth) bladder, vesica a distensible membranous sac (usually containing liquid or gas) acinus one of the small sacs or saclike dilations in a compound gland bursa a small fluid-filled sac located between movable parts of the body especially at joints cistern, cisterna a sac or cavity containing fluid especially lymph or cerebrospinal fluid pocket, pouch (anatomy) saclike structure in any of various animals (as a marsupial or gopher or pelican) cyst, vesicle a small anatomically normal sac or bladderlike structure (especially one containing fluid) air cell, air sac, alveolus a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways pericardial sac the membrane surrounding the heart gastric mill, gizzard, ventriculus thick-walled muscular pouch below the crop in many birds and reptiles for grinding food utricle, utriculus a small pouch into which the semicircular canals open dacryocyst, lacrimal sac, tear sac either of the two dilated ends of the lacrimal ducts at the nasal ends of the eyes that fill with tears secreted by the lacrimal glands gall bladder, gallbladder a muscular sac attached to the liver that stores bile (secreted by the liver) until it is needed for digestion atrial auricle, auricle, auricula atrii a small conical pouch projecting from the upper anterior part of each atrium of the heart auricula, auricular appendage, auricular appendix a pouch projecting from the top front of each atrium of the heart Golgi apparatus, Golgi body, Golgi complex, dictyosome a netlike structure in the cytoplasm of animal cells (especially in those cells that produce secretions) urinary bladder a membranous sac for temporary retention of urine cheek pouch a membranous pouch inside the mouth of many rodents (as a gopher) marsupium an external abdominal pouch in most marsupials where newborn offspring are suckled scrotum the external pouch that contains the testes bleb, blister, bulla (pathology) an elevation of the skin filled with serous fluid follicle any small spherical group of cells containing a cavity liposome an artificially made microscopic vesicle into which nucleic acids can be packaged; used in molecular biology as a transducing vector bodily cavity, cavity, cavum (anatomy) a natural hollow or sinus within the body Sac (once / 15844 pages) n WORD FAMILY Sac: Sacs USAGE EXAMPLES There are artists here in Sac and people are just nicer - more considerate and polite. New York Times(Sep 16, 2016) The mayor tweeted that he's "doing fine" and added, "Thank you to Sac PD for being there." US News(Sep 22, 2016) The mayor tweeted that he’s “doing fine” and said “Thank you to Sac PD for being there.” Washington Times(Sep 22, 2016) n a member of the Algonquian people formerly living in Wisconsin in the Fox River valley and on the shores of Green Bay Syn\|Exp\|Hyper Sauk Makataimeshekiakiak Sauk leader who in 1832 led Fox and Sauk warriors against the United States (1767-1838) Keokuk Sauk leader who aided the United States against Black Hawk (1790-1848) Algonquian, Algonquin a member of any of the North American Indian groups speaking an Algonquian language and originally living in the subarctic regions of eastern Canada; many Algonquian tribes migrated south into the woodlands from the Mississippi River to the Atlantic coast
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