Gym`no*sper"mous (-sp&etilde;r"mŭs), a. [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.