Pronunciation: (on"u-mat"u-pē'u, -mä"tu-), [key]
1. the formation of a word, as cuckoo or boom, by imitation of a sound made by or associated with its referent.
2. a word so formed.
3. Rhet.the use of imitative and naturally suggestive words for rhetorical effect.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.