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. WORD FAMILYsac: sacs USAGE EXAMPLESThe 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 2Syn|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 3Syn|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 sacmembranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional amnion, amnios, amniotic sacthin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) chorionthe outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals) coelenteronthe saclike body cavity of a coelenterate air bladder, float, swim bladderan air-filled sac near the spinal column in many fishes that helps maintain buoyancy air sacany of the membranous air-filled extensions of the lungs of birds air sacany of the thin-walled extensions of the tracheae of insects saccule, sacculusa small sac or pouch (especially the smaller chamber of the membranous labyrinth) bladder, vesicaa distensible membranous sac (usually containing liquid or gas) acinusone of the small sacs or saclike dilations in a compound gland bursaa small fluid-filled sac located between movable parts of the body especially at joints cistern, cisternaa 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, vesiclea small anatomically normal sac or bladderlike structure (especially one containing fluid) air cell, air sac, alveolusa tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways pericardial sacthe membrane surrounding the heart gastric mill, gizzard, ventriculusthick-walled muscular pouch below the crop in many birds and reptiles for grinding food utricle, utriculusa small pouch into which the semicircular canals open dacryocyst, lacrimal sac, tear saceither 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, gallbladdera muscular sac attached to the liver that stores bile (secreted by the liver) until it is needed for digestion atrial auricle, auricle, auricula atriia small conical pouch projecting from the upper anterior part of each atrium of the heart auricula, auricular appendage, auricular appendixa pouch projecting from the top front of each atrium of the heart Golgi apparatus, Golgi body, Golgi complex, dictyosomea netlike structure in the cytoplasm of animal cells (especially in those cells that produce secretions) urinary bladdera membranous sac for temporary retention of urine cheek poucha membranous pouch inside the mouth of many rodents (as a gopher) marsupiuman external abdominal pouch in most marsupials where newborn offspring are suckled scrotumthe external pouch that contains the testes bleb, blister, bulla(pathology) an elevation of the skin filled with serous fluid follicleany small spherical group of cells containing a cavity liposomean 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 EXAMPLESThere 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) KeokukSauk 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 |
随便看 |
英语词典包含147318条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。