Webster's English Dictionary

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cobra

co.bra \'ko--br*\ n [Pg cobra (de capello), lit., hooded snake, fr. L 
   colubra sna]ke : any of several venomous Asiatic and African elapid snakes 
   (genus Naja ) that when excited expand the skin of the neck into a hood by 
   movement of the anterior ribs; also : any of several related African snakes