Source : Webster's Revised Unabridged Dictionary (1913)

Compressible \Com*press"i*ble\, a. [Cf. F. compressible.]
   Capable of being pressed together or forced into a narrower
   compass, as an elastic or spongy substance.

Source : WordNet®

compressible
     adj 1: capable of being compressed or made more compact;
            "compressible packing materials"; "a compressible box"
            [ant: {incompressible}]
     2: capable of being easily compressed [syn: {squeezable}]