Incompressible \In`com*press"i*ble\, 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; as, many liquids and solids appear to be almost
incompressible. -- {In`com*press"i*ble*ness}, n.
[1913 Webster]