1. anapsid - Noun
2. anapsid - Adjective
primitive reptile having no opening in the temporal region of the skull; all extinct except turtles
Source: WordNetAll anapsid skulls lack a temporal opening, while all other extant amniotes have temporal openings (although in mammals the hole has become the zygomatic arch ). Source: Internet
All Permian anapsid reptiles died out except the procolophonids ( testudines have anapsid skulls but are most often thought to have evolved later, from diapsid ancestors). Source: Internet
The earliest amniotes were superficially lizard-like, but had solid, box-like skulls, with openings only for eyes and nostrils, termed the anapsid condition. Source: Internet