Webster's English Dictionary

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phoneme

pho.neme \'fo--.ne-m\ n [F phone'me, fr. Gk pho-ne-mat-, pho-ne-ma speec]h 
   sound, utterance, fr. pho-nein to sound : a member of the set of the 
   smallest units of speech that serve to distin guish one utterance from 
   another in a language or dialect {the p of English pin and the f of English 
   fin are two different ~s}