Wordnet 3.0
NOUN (1)
1.
extinct terrestrial reptiles having teeth set in sockets;
of the late Permian to Triassic;
[syn: Thecodontia, order Thecodontia]
The Collaborative International Dictionary of English v.0.48:
Thecodontia \The`co*don"ti*a\, n. pl. [NL.] (Paleon.)
A group of fossil saurians having biconcave vertebrae and the
teeth implanted in sockets.
[1913 Webster]
WordNet (r) 3.0 (2006):
Thecodontia
n 1: extinct terrestrial reptiles having teeth set in sockets;
of the late Permian to Triassic [syn: Thecodontia, order
Thecodontia]