'ictodosaur' definitions:

Definition of 'ictodosaur'

(from WordNet)
noun
Intermediate in form between the therapsids and most primitive true mammals

Definition of 'ictodosaur'

From: GCIDE
  • ictodosaur \ictodosaur\ n. An extinct reptile intermediate in form between the therapsids and most primitive true mammals. [WordNet 1.5]