形容詞 echoic:

1. (of words) formed in imitation of a natural sound- Harry Hoijer
   同義詞：imitative, onomatopoeic, onomatopoeical, onomatopoetic
2. like or characteristic of an echo
   同義詞：echolike

e.cho.ic

adj.（形容詞）
Of or resembling an echo.
回聲的：回聲的或象回聲的
Imitative of natural sounds; onomatopoeic:
擬聲的：模擬自然聲音的；擬聲的：
例句：
an echoic word.
擬聲詞