The Collaborative International Dictionary
microphonic
microphonic \mi`cro*phon"ic\ (m[imac]`kr[-o]*f[o^]n"[i^]k), a. Of or pertaining to a microphone; serving to intensify weak sounds.
Wiktionary
microphonic
a. Of or relating to microphonics.
Usage examples of "microphonic".
With this stuff, he could make a microphonic listening and amplifying device that would pick up the buzz of a fly at the distance of half a mile.