Source : Webster's Revised Unabridged Dictionary (1913)

Gymnosperm \Gym"no*sperm\, n. (Bot.)
   A plant that bears naked seeds (i. e., seeds not inclosed in
   an ovary), as the common pine and hemlock. Cf. {Angiosperm}.

Source : WordNet®

gymnosperm
     n : plants of the class Gymnospermae having seeds not enclosed
         in an ovary