onomatopoeic

onomatopoeettinen Of or relating to onomatopoeia.
Having the property of onomatopoeia.
(quote-book)

There are also three ways in which katakana is used for writing Japanese words:1 to make words stand out, for example, in advertising: トヨタ (Toyota)2 to classify species of plants and animals, for example in botanical gardens3 to write onomatopoeic words