noun a lizard of the genus basiliscus, belonging to the family iguanidae.
2. basilisk ·noun a large piece of ordnance, so called from its supposed resemblance to the serpent of that name, or from its size.
3. basilisk ·noun a fabulous serpent, or dragon. the ancients alleged that its hissing would drive away all other serpents, and that its breath, and even its look, was fatal. ·see cockatrice.