Webster's English Dictionary

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cyanide

1. cy.a.nide \'si--*-.ni-d, -n*d\ n [ISV] : a compound of cyanogen usu. 
   with a more electropositive element or radic al
2. cy.a.nide \-.ni-d\ vt : to treat with a cyanide; specif : to treat (iron 
   or steel) with  molten cyanide to produce a hard surface