mammallike reptile

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• dimetrodon — /duy me treuh don /, n. an extinct carnivorous mammallike reptile, of the genus Dimetrodon, dominant in North America during the Permian Period, up to 10 ft. (3.1 m) long and usually bearing spinal sails. [ < NL (1878), equiv. to Gk dímetr(os)… …   Universalium

• Mammary gland — in a human female Cross section of the breast of a human female …   Wikipedia

• dimetrodon — di•met•ro•don [[t]daɪˈmɛ trəˌdɒn[/t]] n. pal an extinct carnivorous mammallike reptile of the North American Permian genus Dimetrodon, with high spines along the back • Etymology: < NL (1878) = Gk dímetr(os) having two measures (see dimeter)… …   From formal English to slang

• tri|tyl|o|dont — «try TIHL uh dont», noun. a small mammallike reptile of the late Triassic and early Jurassic periods, having a long body and short legs, multiple bones in the lower jaw and cusped teeth. It is regarded as an evolutionary link between reptiles and …   Useful english dictionary

• mammal — mammallike, adj. /mam euhl/, n. any vertebrate of the class Mammalia, having the body more or less covered with hair, nourishing the young with milk from the mammary glands, and, with the exception of the egg laying monotremes, giving birth to… …   Universalium

• vertebrate — /verr teuh brit, brayt /, adj. 1. having vertebrae; having a backbone or spinal column. 2. belonging or pertaining to the Vertebrata (or Craniata), a subphylum of chordate animals, comprising those having a brain enclosed in a skull or cranium… …   Universalium

• animal — animalic /an euh mal ik/, animalian /an euh may lee euhn, mayl yeuhn/, adj. /an euh meuhl/, n. 1. any member of the kingdom Animalia, comprising multicellular organisms that have a well defined shape and usually limited growth, can move… …   Universalium

• therapsid — /theuh rap sid/, n. 1. any of various groups of mammallike reptiles of the extinct order Therapsida, inhabiting all continents from mid Permian to late Triassic times, some of which were probably warm blooded and directly ancestral to mammals.… …   Universalium

• community ecology — Introduction       study of the organization and functioning of communities (community), which are assemblages of interacting populations of the species living within a particular area or habitat.       As populations of species interact with one …   Universalium

• cynodont — ▪ fossil reptile suborder       (suborder or infraorder Cynodontia), mammallike reptiles of the order Therapsida (see therapsid) that existed from the Late Permian to the Early Jurassic Epoch (258 to 187 million years ago). Cynodont fossils have… …   Universalium