Definition of basilisk noun from the Oxford Advanced Learner's Dictionary

 

basilisk

 noun
noun
BrE BrE//ˈbæzɪlɪsk//
 
; NAmE NAmE//ˈbæzɪlɪsk//
 
 
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(in ancient stories) a creature like a snake, which can kill people by looking at them or breathing on them Word Origin late Middle English: via Latin from Greek basiliskos ‘little king, serpent’, from basileus ‘king’.
See the Oxford Advanced American Dictionary entry: basilisk