Synonyms for Echoic (same or very similar meaning)
WordNet sense 1 (like or characteristic of an echo):
echolikeWordNet sense 2 ((especially of incident sound or light) bent or sent back):
reflectedWordNet sense 3 ((of words) formed in imitation of a natural sound):
imitative, onomatopoeic, onomatopoetic, onomatopoeicalFrom the ODE community, based on WordNetadd/edit