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cynodont

British

/ ˈsaɪnəˌdɒnt /

noun

a carnivorous mammal-like reptile of the late Permian and Triassic periods, whose specialized teeth were well developed

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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The study, titled "Biomechanics of the mandibular middle ear of the cynodont Thrinaxodon and the evolution of mammal hearing," was supported by UChicago, the National Institutes of Health, and the National Science Foundation.

From Science Daily • Jan. 19, 2026

Kemp, T. S. Acoustic transformer function of the postdentary bones and quadrate of a nonmammalian cynodont.

From Nature • Nov. 12, 2017

Cranial anatomy of the cynodont reptile Thrinaxodon liorhinus.

From The Adductor Muscles of the Jaw In Some Primitive Reptiles by Fox, Richard C.

Yes, the first mammals developed from a reptile known as the cynodont.

From Unexplored! by Chaffee, Allen

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023