| 释义 |
mammal
mam·mal M0068100 (măm′əl)n. Any of various warm-blooded vertebrate animals of the class Mammalia, including humans, characterized by a covering of hair on the skin and, in the female, milk-producing mammary glands for nourishing the young.
[From Late Latin mammālis, of the breast, from Latin mamma, breast; see mā- in Indo-European roots.]
mam·ma′li·an (mă-mā′lē-ən) adj. & n.mammal (ˈmæməl) n (Zoology) any animal of the Mammalia, a large class of warm-blooded vertebrates having mammary glands in the female, a thoracic diaphragm, and a four-chambered heart. The class includes the whales, carnivores, rodents, bats, primates, etc[C19: via New Latin from Latin mamma breast] mammalian adj, n ˈmammal-ˌlike adjmam•mal (ˈmæm əl)
n. any warm-blooded vertebrate of the class Mammalia, characterized by a covering of hair on some or most of the body, a four-chambered heart, and nourishment of the newborn with milk from maternal mammary glands. [1820–30; as singular of New Latin Mammalia, neuter pl. of Late Latin mammālis of the breast. See mamma2, -al1] mam·mal (măm′əl) Any of various warm-blooded vertebrate animals whose young feed on milk that is produced by the mother's mammary glands. Unlike other vertebrates, mammals have a diaphragm that separates the heart and lungs from the other internal organs, red blood cells that lack a nucleus, and usually hair or fur. All mammals but the monotremes bear live young. Dogs, mice, whales, and humans are mammals.mammal- amniocentesis, amnion - Amniocentesis is formed by amnion, the innermost membrane enclosing a fetus, and Greek kentesis, "pricking."
- endoskeleton - Contained entirely within the body of an animal, like that of mammals.
- pelage - The fur, hair, wool, etc. of a mammal.
- rhinarium - The hairless, habitually moist nose of some mammals, such as the antelope.
Thesaurus| Noun | 1. |  mammal - any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milkmammaliancraniate, vertebrate - animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or craniumAmniota - higher vertebrates (reptiles, birds and mammals) possessing an amnion during developmentamnion, 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)allantois - the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals)class Mammalia, Mammalia - warm-blooded vertebrates characterized by mammary glands in the femalefemale mammal - animals that nourish their young with milktusker - any mammal with prominent tusks (especially an elephant or wild boar)prototherian - primitive oviparous mammals found only in Australia and Tasmania and New Guineametatherian - primitive pouched mammals found mainly in Australia and the Americaseutherian, eutherian mammal, placental, placental mammal - mammals having a placenta; all mammals except monotremes and marsupialspelage, coat - growth of hair or wool or fur covering the body of an animalfossorial mammal - a burrowing mammal having limbs adapted for diggingpilus, hair - any of the cylindrical filaments characteristically growing from the epidermis of a mammal; "there is a hair in my soup"biauriculate heart - a heart (as of mammals and birds and reptiles) having two auriclesmount, ride - copulate with; "The bull was riding the cow"digitigrade - (of mammals) walking on the toes with the posterior part of the foot raised (as cats, dogs, and horses do)plantigrade - (of mammals) walking on the whole sole of the foot (as rabbits, raccoons, bears, and humans do)estrous - (of lower mammals) showing or in a state of estrus; in heat; "the estrous state"; "the estrous cycle"anestrous - (of lower mammals) not in a state of estrus; not in heat; "an anestrous bitch"weaned - freed of dependence on something especially (for mammals) mother's milk; "the just-weaned calf bawled for its mother" |
mammal see anteaters and other edentates, bats, carnivores, cattle and other artiodactyls, horses, rhinos and other perissodactyls, marsupials, monkeys, apes and other primates, rabbits and hares, rodents, sea mammals, shrews and other insectovores, whales and dolphinsProverbs
"The leopard does not change his spots"Extinct mammals apeman, aurochs, australopithecine, baluchitherium, chalicothere, creodont, dinoceras or uintathere, dinothere, dryopithecine, eohippus, glyptodont, Irish elk, labyrinthodont, mammoth, mastodon, megathere, nototherium, quagga, sabre-toothed tiger or cat, tarpan, titanothereTranslationsmammal (ˈmӕməl) noun any member of the class of animals (including man) in which the females feed the young with their own milk. Monkeys are mammals. 哺乳動物 哺乳动物mamˈmalian (-ˈmei-) adjective 哺乳動物的 哺乳动物的mammal
mammal, an animal of the highest class of vertebrates, the Mammalia. The female has mammary glands, which secrete milk for the nourishment of the young after birth. In the majority of mammals the body is partially or wholly covered with hair; the heart has four chambers, and only the left aortic arch is present; and a muscular diaphragm separates the chest from the abdominal cavity. Mammals are warm-blooded; that is, they have a relatively constant body temperature independent of the temperature of their surroundings. The mature red blood cells (erythrocytes) usually lack a nucleus. Except for the egg-laying monotremes (the platypusplatypus
, semiaquatic egg-laying mammal, Ornithorhynchus anatinus, of Tasmania and E Australia. Also called duckbill, or duckbilled platypus, it belongs to the order Monotremata (see monotreme), the most primitive group of living mammals.
..... Click the link for more information. and the echidna, or spiny anteater), mammals give birth to live young. A marsupialmarsupial
, member of the order Marsupialia, or pouched mammals. With the exception of the New World opossums and an obscure S American family (Caenolestidae), marsupials are now found only in Australia, Tasmania, New Guinea, and a few adjacent islands.
..... Click the link for more information. is born in a more undeveloped state than the young of other mammals, although all are relatively helpless at birth. In some marsupials and in higher mammals the young receive prenatal nourishment through a placentaplacenta
or afterbirth,
organ that develops in the uterus during pregnancy. It is a unique characteristic of the higher (or placental) mammals. In humans it is a thick mass, about 7 in. (18 cm) in diameter, liberally supplied with blood vessels.
..... Click the link for more information. . The order Carnivora, or flesh-eating animals, includes terrestrial families such as the cat, dog, and bear as well as the aquatic seal, sea lion, and walrus. Other aquatic mammals are the whale, porpoise, and dolphin of the order Cetacea and the manatee and dugong of the order Sirenia. Unusual adaptations are also found in the bat (order Chiroptera); in the elephant (order Proboscidea); in the sloth, armadillo, and anteater (order Edentata); and in the beaver, woodchuck, porcupine, and squirrel (order Rodentia). The order Soricomorpha includes the shrew and the mole, and the spiny and hairy hedgehogs form Erinaceomorpha; both orders were formerly classed as Insectivora. There are two groups of ungulates, or hoofed mammals: most members of the order Perissodactyla, including the horse and the rhinoceros, are odd-toed, with the third digit the largest; those of the order Artiodactyla, including the deer, antelope, camel, pig, and cow, are even-toed, with the third and fourth digits symmetrical and functional. Humans, monkeys, apes, and lemurs belong to the order Primates. Some remains of mammals are identified as from the Jurassic period of the Mesozoic era, but mammals remained small creatures during the Mesozoic. The group became diversified relatively rapidly in geological terms in the Tertiary period of the Cenozoic era after the dinosaurs had become extinct. Bibliography See E. P. Walker et al., Mammals of the World (2 vol., rev. ed. 1968); S. Anderson, ed., Simon & Schuster's Guide to Mammals (1984); G. B. Corbett and J. E. Hill, World List of Mammalian Species (1986); H. H. Genoways, ed., Current Mammalogy (2 vol., 1987–89). mammal[′mam·əl] (vertebrate zoology) A member of Mammalia. mammal any animal of the Mammalia, a large class of warm-blooded vertebrates having mammary glands in the female, a thoracic diaphragm, and a four-chambered heart. The class includes the whales, carnivores, rodents, bats, primates, etc. mammal
mammal [mam´al] an individual of the Mammalia, a division of vertebrates, including all that possess hair and suckle their young. adj., adj mammal´ian.mam·mal (mam'ăl), An animal of the class Mammalia.mammal (măm′əl)n. Any of various warm-blooded vertebrate animals of the class Mammalia, including humans, characterized by a covering of hair on the skin and, in the female, milk-producing mammary glands for nourishing the young.
mam·ma′li·an (mă-mā′lē-ən) adj. & n.mammal any animal of the class Mammalia, a group of about 4250 species, often regarded as the most highly evolved animals, and so named because they all possess MAMMARY GLANDS. There are three living subclasses: - Monotremata - MONOTREMES, primitive egg-laying mammals such as the duck-billed platypus and Echidna, the spiny ant eater.
- Marsupialia - MARSUPIALS, which transfer their young to pouches for the latter part of their early development.
- Eutheria - EUTHERIANS, which have a placenta.
Mammals are characterized by the presence of hair, a DIAPHRAGM used in AERIAL RESPIRATION, milk secretion in the female (LACTATION) for suckling the young, presence of only the left systemic arch in the blood circulatory system, three auditory ossicles in the ear, and a lower jaw of a single pair of bones. In all classes except the monotremes, the young are born live (see VIVIPAROUS). mammal
Synonyms for mammalnoun any warm-blooded vertebrate having the skin more or less covered with hairSynonymsRelated Words- craniate
- vertebrate
- Amniota
- amnion
- amnios
- amniotic sac
- chorion
- allantois
- class Mammalia
- Mammalia
- female mammal
- tusker
- prototherian
- metatherian
- eutherian
- eutherian mammal
- placental
- placental mammal
- pelage
- coat
- fossorial mammal
- pilus
- hair
- biauriculate heart
- mount
- ride
- digitigrade
- plantigrade
- estrous
- anestrous
- weaned
|