Webster's English Dictionary

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hyphen

hy.phen \'hi--f*n\ \'hi-f-(*-)nin\ n or hy.phen.ing [LL & Gk; LL, fr. Gk, 
   fr. hyph' hen under one, fr. hypo under + ]hen, neut. of heis one - more at 
   UP, SAME : a punctuation mark - used to divide or to compound words or word 
   element s - hyphen vt