Source : Webster's Revised Unabridged Dictionary (1913)

Gymnospermous \Gym"no*sper`mous\, n. [Gr. gymno`spermos; gymno`s
   naked + spe`rma seed: cf. F. gymnosperme.] (Bot.)
   (a) Having naked seeds, or seeds not inclosed in a capsule or
       other vessel.
   (b) Belonging to the class of plants consisting of
       gymnosperms.

Source : WordNet®

gymnospermous
     adj : relating to or characteristic of plants of the class
           Gymnospermae