Definition of "compressable"

Natural, or man-made, sources of sound consist in general of physical mechanisms which generate fluctuating volumes, or gradients of force, in a compressable medium.

1989, Sam Hanish, A treatise on acoustic radiation, page 433

[…] a generally solid parallelepipedon of a compressable polymeric material that is beveled to define a plurality of movable wedge-shaped members having rhomboid-shaped opposed end walls […]

1999, Official Gazette of the United States Patent and Trademark Office, page 2924