Onomatopoeettinen tai onomatopoieettinen (kreik. onomatopoiesis, suom. nimen sepittäminen) on ääntä muistuttava tai jäljittelevä sana tai sanonta.
Ernst Havlik’s (1981) Lexikon der Onomatopoien is an entire dictionary consisting only of comic strip sound effects. It contains an introductory analysis, 2222 onomatopoeic items, and 111 illustrations. The section on kissing, for instance, contains glork, schmatz, schuic, shluk, smack, smurp and shmersh — quite a poetic collection in itself. More unexpected are woin and töff, both of which are intended to represent the sound of a car horn. A breaking car apparently goes tata in at least one source, and from a ‘scientific laboratory,’ one gets to hear foodle, grink, and sqwunk. Perhaps even more interesting are the sounds floop, flop and flomp, which represent the sound of a bra being taken off. Anyone prejudiced against the genre as such, may see it as a confirmation that the sections on ‘violence’ take up 17 pages, while that devoted to ‘thinking’ consists of a mere five lines.