cockatrice
A mythological serpent, reputed to have hatched from a rooster's egg and capable of killing man and beast with its stare. Also known as basilisk.
Mischiefs are like a cockatrice's eye; if they see first, they kill; if seen, they die.
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14th century. Via Old French cocatris from medieval Latin calcatrix, "tracker" from Latin calcare, "to track."