Source : Webster's Revised Unabridged Dictionary (1913)

Onomatopoeic \On`o*mat`o*p[oe]"ic\, a.
   Onomatopoetic. --Whitney.

Source : WordNet®

onomatopoeic
     adj 1: of or relating to or characterized by onomatopoeia [syn: {onomatopoetic}]
     2: (of words) formed in imitation of a natural sound;
        "onomatopoeic words are imitative of noises"; "it was
        independently developed in more than one place as an
        onomatopoetic term"- Harry Hoijer [syn: {echoic}, {imitative},
         {onomatopoeical}, {onomatopoetic}] [ant: {nonechoic}]