The Collaborative International Dictionary of English v.0.48:

Lacertilia \Lac`er*til"i*a\, n. pl. [NL., fr. L. lacertus a
   lizard.] (Zool.)
   An order of Reptilia, which includes the lizards.
   [1913 Webster]

   Note: They are closely related to the snakes, and like the
         latter, usually have the body covered with scales or
         granules. They usually have eyelids, and most of then
         have well-formed legs; but in some groups
         (amphisb[ae]na, glass-snake, etc.) the legs are absent
         and the body is serpentlike. None are venomous, unless
         Heloderma be an exception. The order includes the
         chameleons, the Cionocrania, or typical lizards, and
         the amphisb[ae]nas. See Amphisb[ae]na, Gecko, Gila
         monster, and Lizard.
         [1913 Webster]

WordNet (r) 3.0 (2006):

Lacertilia
    n 1: true lizards; including chameleons and geckos [syn:
         Sauria, suborder Sauria, Lacertilia, suborder
         Lacertilia]