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Toxodonta :: Toxodonta (n.pl.) An extinct order of Mammalia found in the South American Tertiary formation. The incisor teeth were long and curved and provided with a persistent pulp. They are supposed to be related both to the rodents and ungulates. Called also Toxodontia.

Mammiferous :: Mammiferous (a.) Having breasts; of, pertaining to, or derived from, the Mammalia..

Monotremata :: Monotremata (n. pl.) A subclass of Mammalia, having a cloaca in which the ducts of the urinary, genital, and alimentary systems terminate, as in birds. The female lays eggs like a bird. See Duck mole, under Duck, and Echidna..

Implacentalia :: Implacentalia (n. pl.) A primary division of the Mammalia, including the monotremes and marsupials, in which no placenta is formed..

Ovulation :: Ovulation (n.) The formation of ova or eggs in the ovary, and the discharge of the same. In the mammalian female the discharge occurs during menstruation..

Mammaliferous :: Mammaliferous (a.) Containing mammalian remains; -- said of certain strata.

Mammalia :: Mammalia (n. pl.) The highest class of Vertebrata. The young are nourished for a time by milk, or an analogous fluid, secreted by the mammary glands of the mother..

Dermoptera :: Dermoptera (n. pl.) An order of Mammalia; the Cheiroptera.

Mammifer :: Mammifer (n.) A mammal. See Mammalia.

Monodelphia :: Monodelphia (n. pl.) The group that includes all ordinary or placental mammals; the Placentalia. See Mammalia.

Breast :: Breast (n.) Either one of the protuberant glands, situated on the front of the chest or thorax in the female of man and of some other mammalia, in which milk is secreted for the nourishment of the young; a mamma; a teat..

Tillodontia :: Tillodontia (n. pl.) An extinct group of Mammalia found fossil in the Eocene formation. The species are related to the carnivores, ungulates, and rodents. Called also Tillodonta..

Unguiculata :: Unguiculata (n. pl.) An extensive division of Mammalia including those having claws or nails, as distinguished from the hoofed animals (Ungulata)..

Placentalia :: Placentalia (n. pl.) A division of Mammalia including those that have a placenta, or all the orders above the marsupials..

Zonaria :: Zonaria (n. pl.) A division of Mammalia in which the placenta is zonelike.

Vertebrata :: Vertebrata (n. pl.) One of the grand divisions of the animal kingdom, comprising all animals that have a backbone composed of bony or cartilaginous vertebrae, together with Amphioxus in which the backbone is represented by a simple undivided notochord. The Vertebrata always have a dorsal, or neural, cavity above the notochord or backbone, and a ventral, or visceral, cavity below it. The subdivisions or classes of Vertebrata are Mammalia, Aves, Reptilia, Amphibia, Pisces, Marsipobranchia, and Lep

Mammal :: Mammal (n.) One of the Mammalia.

Lyencephala :: Lyencephala (n. pl.) A group of Mammalia, including the marsupials and monotremes; -- so called because the corpus callosum is rudimentary..

Gyrencephala :: Gyrencephala (n. pl.) The higher orders of Mammalia, in which the cerebrum is convoluted..

Mastology :: Mastology (n.) The natural history of Mammalia.

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