definition of
echoic

[1] #1 echoic a. [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. wn

[2] #2 echoic s. [echolike] like or characteristic of an echo. wn