Pŏl'y-a-cous'tic1, a.
a. [Fr. polyacoustique, from Gr. πολύς, many, and ἀκουστικός, acoustic.] Tending to multiply or magnify sound.
2 entries under this word
Polyacoustic
Pōl'y-a-cous'tic2, n.
n. [See supra.] An instrument to multiply sounds.