synapsid
noun
any of a subclass Synapsida including mammals and their extinct relatives and having one temporal opening on each side of the skull.
synapsids
-
pluralof synapsid.plural
The grammatical form denoting more than one person, place, thing, or idea.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Unable to warm themselves in the sun, these small, vole-like synapsids began burning calories to generate heat.
From The Wall Street Journal ● Nov. 13, 2025
Hellert created a massive family tree of the synapsids, the group of animals of which mammals are the last surviving members.
From Science Daily ● Oct. 5, 2023
At some points, larger synapsids were the ones that survived, and the winners weren't just generalist insect-eaters.
From Science Daily ● Oct. 5, 2023
These synapsids, he added, “are more closely related to us than any dinosaur or other reptile.”
From New York Times ● May 22, 2023
This arrangement of jaw and ear bones aids in distinguishing fossil mammals from fossils of other synapsids.
From Textbooks ● Jan. 1, 2015
