"pertaining to, characterized by, or of the nature of onomatopoeia," 1835, from French onomatopoéique or else from onomatopoeia + -ic. Other adjectival forms include onomatopoeial; onomatopoetic (1827); onomatopoeous (1660s).
"formation of words or names by imitation of natural sounds; the naming of something by a reproduction of the sound made by it or a sound associated with it," 1570s, from Late Latin onomatopoeia, from Greek onomatopoiia "the making of a name or word" (in imitation of a sound associated with the thing being named), from onomatopoios, from onoma (genitive onomatos) "word, name" (from PIE root *no-men- "name") + a derivative of poiein "compose, make" (see poet).
Middle English -ik, -ick, word-forming element making adjectives, "having to do with, having the nature of, being, made of, caused by, similar to," from French -ique and directly from Latin -icus or from cognate Greek -ikos "in the manner of; pertaining to." From PIE adjective suffix *-(i)ko, which also yielded Slavic -isku, adjectival suffix indicating origin, the source of the -sky (Russian -skii) in many surnames. In chemistry, indicating a higher valence than names in -ous (first in benzoic, 1791).
In Middle English and after often spelled -ick, -ike, -ique. Variant forms in -ick (critick, ethick) were common in early Modern English and survived in English dictionaries into early 19c. This spelling was supported by Johnson but opposed by Webster, who prevailed.
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Harper, D. (n.d.). Etymology of onomatopoeic. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/onomatopoeic