What does cynodont mean?
A cynodont is an extinct member of the Cynodontia, a group of advanced synapsids often described as mammal-like reptiles, though they are not true reptiles in modern classification. Living mainly during the Triassic period and surviving into later eras, cynodonts are notable for their differentiated teeth — including canine-like teeth — which gave the group its name, meaning 'dog tooth.' They are of special interest to scientists because they stand very close to the evolutionary line leading to mammals; many features associated with mammals, such as improved jaw mechanics and possibly warm-bloodedness and body covering, appear in various degrees among cynodonts. The word appears almost exclusively in palaeontological literature and science writing, carrying a neutral, scholarly tone. For readers of natural history, 'cynodont' marks a key chapter in the story of how mammals — and ultimately humans — came to be.
nounAny of an extinct group of advanced synapsids (formerly called mammal-like reptiles) that possessed dog-like teeth and were closely related to the ancestors of mammals.
- A member of the Cynodontia, an extinct clade of therapsid synapsids characterized by differentiated teeth including canine-like postcanines, regarded as close relatives of mammal ancestors.
"The fossil skull suggested that the animal was a cynodont, placing it among the closest relatives of early mammals."
"Fossils show that some cynodonts may already have had hair and whiskers."
"The transition from cynodont to true mammal is one of the best-documented in vertebrate evolution."
Standard regular plural; used when referring to multiple members of the group.
"Early cynodonts showed a gradual shift toward the jaw structure seen in mammals."
The word literally means 'dog tooth' — and these dog-toothed creatures from over 200 million years ago turned out to be our own ancestors' nearest cousins.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cynodont
The word derives from the Ancient Greek roots kyōn ('dog') and odōn, stem odont-, ('tooth'), reflecting the dog-like dentition characteristic of these animals. It was formed on the model of other scientific terms built with the combining form -odont. Related formations from the same tooth root include mastodon, orthodont, and periodontal, while the element cyno-, from the Greek word for dog, appears in words such as cynic and cynosure.
How cynodont is actually used
A technical term used chiefly in palaeontology and evolutionary biology rather than in everyday speech. Pluralization follows standard English form.
Easily confused with cynodont
"Cyanodont" is not a recognized English word and may be misread for "cynodont" because of the similar opening letters; only "cynodont" names the extinct mammal-relative.