from the GNU version of the Collaborative International Dictionary of English
- n.pl. See theriodonta.
from The Century Dictionary and Cyclopedia
- An order of fossil reptiles, of the Permian period, so called from certain resemblances they present to mammals.
Sorry, no etymologies found.
In the same way the opinion that the theromorpha, a kind of reptile, are the aboriginal form of vertebrates, has not proved tenable.