Use the adjective reptilian to describe a reptile: your pet iguana, while also sweet and possibly cuddly, is definitely reptilian.

Crocodiles, lizards, and turtles are all reptiles, and you can therefore describe all of them as reptilian. A reptilian animal is not a mammal or a bird, and it is most likely cold-blooded and egg laying. You can also use the word reptilian to describe something — or someone — that reminds you of a reptile. The Latin root is reptilis, which means "creeping or crawling."

Definitions of reptilian
  1. adjective
    of or relating to the class Reptilia
  2. noun
    any cold-blooded vertebrate of the class Reptilia including tortoises, turtles, snakes, lizards, alligators, crocodiles, and extinct forms
    synonyms: reptile
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    anapsid, anapsid reptile
    primitive reptile having no opening in the temporal region of the skull; all extinct except turtles
    diapsid, diapsid reptile
    reptile having a pair of openings in the skull behind each eye
    Diapsida, subclass Diapsida
    used in former classifications to include all living reptiles except turtles; superseded by the two subclasses Lepidosauria and Archosauria
    synapsid, synapsid reptile
    extinct reptile having a single pair of lateral temporal openings in the skull
    chelonian, chelonian reptile
    a reptile of the order Chelonia
    Sphenodon punctatum, tuatara
    only extant member of the order Rhynchocephalia of large spiny lizard-like diapsid reptiles of coastal islands off New Zealand
    any of various reptiles of the suborder Sauria which includes lizards; in former classifications included also the crocodiles and dinosaurs
    archosaur, archosaurian, archosaurian reptile
    extinct reptiles including: dinosaurs; plesiosaurs; pterosaurs; ichthyosaurs; thecodonts
    crocodilian, crocodilian reptile
    extant archosaurian reptile
    protomammal, therapsid
    probably warm-blooded; considered direct ancestor of mammals
    intermediate in form between the therapsids and most primitive true mammals
    large primitive reptile having a tall spinal sail; of the Permian or late Paleozoic in Europe and North America
    heavy-bodied reptile with a dorsal sail or crest; of the late Paleozoic
    carnivorous dinosaur of the Permian in North America having a crest or dorsal sail
    ophidian, serpent, snake
    limbless scaly elongate reptile; some are venomous
    type of:
    craniate, vertebrate
    animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium
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