(in R.V., Isaiah 11:8; 14:29; 59:5; Jeremiah 8:17), the "king serpent," as the name imports; a fabulous serpent said to be three spans long, with a spot on its head like a crown. Probably the yellow snake is intended. (see COCKATRICE.)

Noah Webster's New International Dictionary of the English Language

1. (n.) 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.

2. (n.) A lizard of the genus Basiliscus, belonging to the family Iguanidae.

3. (n.) A large piece of ordnance, so called from its supposed resemblance to the serpent of that name, or from its size.