Source : Webster's Revised Unabridged Dictionary (1913)

Expansible \Ex*pan"si*ble\, a. [Cf. F. expansible.]
   Capable of being expanded or spread out widely.

         Bodies are not expansible in proportion to their
         weight.                                  --Grew.
   -- {Ex*pan"si*ble*ness},n. -{Ex*pan"si*bly},adv.

Source : WordNet®

expansible
     adj 1: able to expand or be expanded [syn: {expandable}, {expandible}]
     2: (of gases) capable of expansion [syn: {expandable}, {expandible},
         {expansile}]