Basilisk

(in R.V., Isa 11:8; Isa 14:29; Isa 59:5; Jer 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.)

From Easton’s Bible Dictionary (1897), by Matthew George Easton.