Emily Dickinson Lexicon

ON-OM'A-TOPE, n. [or ON-OM'A-TO-PY; Gr. ονοματοποιια; ονομα, name, and ποιεω, to make.]

1. In grammar and rhetoric, a figure in which words are formed to resemble the sound made by the thing signified; as, to buzz, as bees; to crackle, as burning thorns or brush. – Encyc.
2. A word whose sound corresponds to the sound of the thing signified.