- A mythical (and heraldic) snake-like dragon type, reputed to be so venomous that its gaze was deadly.
- (heraldiccharge) A type of dragon used in heraldry.
- A tree-dwelling type of lizard of the genus - the basilisk lizard
- A type of large brass cannon.
Inherited from Middle English basilisk derived from Old French basilique derived from Latin basiliscus derived from Ancient Greek βασιλίσκος (little king, imperial, royal).
little king, imperial, royal