a. [ Cf. F. compressible. ] Capable of being pressed together or forced into a narrower compass, as an elastic or spongy substance. [ 1913 Webster ]
n. The quality of being compressible; compressibility. [ 1913 Webster ]
a. [ Pref. in- not + compressible: cf. F. incompressible. ] Not compressible; incapable of being reduced by force or pressure into a smaller compass or volume; resisting compression;