basilisk /ˈbæzɪlɪsk/noun 5adjective 1forms 1 noun5 •A mythical snake-like dragon, so venomous that even its gaze is deadly. •A type of dragon used in heraldry. •Any tree-dwelling lizard of the genus Basiliscus: the basilisk lizard.As a guide to start your collection we'd suggest either iguanas, tejus, swifts, basilisks, horned toads or alligator lizards. — 1965 •An infohazard or cognitohazard, especially a Langford's basilisk.A basilisk, in this context, is information that can hurt you simply because you are aware of it. — 2019 •A type of large brass cannon.Awake ye men of Memphis, heare the clange / Of Scythian trumpets, heare the Basiliskes, / That roaring, shake Damascus turrets downe, […] — 1587 adjective1 •Suggesting a basilisk (snake-like dragon): baleful, spellbinding.Well, She is so basilisk; there's no death in her eyes […] — 1870 formsbasilisks