echoic, imitative, onomatopoeic, onomatopoeical, onomatopoetic -- ((of words) formed in imitation of a natural sound; "onomatopoeic words are imitative of noises"; "it was independently developed in more than one place as an onomatopoetic term"- Harry Hoijer)
echoic, echolike -- (like or characteristic of an echo)
(TTS Sound)
