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Definition of LIZARD
: any of a suborder (Lacertilia) of reptiles distinguished from the snakes by a fused inseparable lower jaw, a single temporal opening, two pairs of well differentiated functional limbs which may be lacking in burrowing forms, external ears, and eyes with movable lids; broadly: any relatively long-bodied reptile (as a crocodile or dinosaur) with legs and tapering tail
Any of about 4,450 species of reptiles constituting the suborder Sauria. They are most diverse and abundant in the tropics but are found from the Arctic Circle (one species) to southern Africa, South America, and Australia. Like snakes, lizards have scales, paired male copulatory organs, and a flexible skull. Typical lizards have a moderately cylindrical body, four well-developed legs (although some lizards are legless), a tail slightly longer than the head and body combined, and movable lower eyelids. They range in size from 1-in. (3-cm) geckos to the 10-ft (3-m) Komodo dragon, but most are about 12 in. (30 cm) long. Ornamentation includes crests on the head, back, or tail; spines; brightly coloured throat fans; and throat frills. Most species feed on insects and rodents, but some, such as the iguana, eat plants. See alsoGila monster; horned toad.