Definition of lacertilian:

part of speech: adjective

Pert. to the family of lizards.

Usage examples:

• He had no sooner disappeared into the little room, the door of which he left slightly open, when I mentally consigned the green lizards and, in fact, the whole lacertilian family to a place warmer than the plains of Aquazilia in summer even, and sat idly wondering how long it would be before I saw Dolores again. Henry Curties in "A Queen's Error".