n. A fabulous creature formerly believed to exist, variously regarded as a kind of serpent, lizard, or dragon, and sometimes identified with the cockatrice.n. In herpetology, a lizard of the old genus Basiliscus (which see) in the widest sense.n. In ornithology, the golden-crested wren or kinglet. See basiliscus, 2.n. A large piece of ordnance: so called from its destructive power.Pertaining to or characteristic of the basilisk: as, a basilisk eye or look (a sharp, penetrating,malignant eye or look, like that attributed to the basilisk).