phonocamptic

from The Collaborative International Dictionary of English v.0.48

Phonocamptic \Pho`no*camp"tic\, a. [Phono- + Gr. ka`mptein to
   bend: cf. F. phonocamptique.]
   Reflecting sound. [R.] "Phonocamptic objects." --Derham.
   [1913 Webster]