Source : Webster's Revised Unabridged Dictionary (1913)

Prolific \Pro*lif"ic\, a. [F. prolifique, fr. L. proles
   offspring (from pro for, forward + the root of alere to
   nourish) + facere to make. See {Adult}, {Old}, and {Fact}.]
   1. Having the quality of generating; producing young or
      fruit; generative; fruitful; productive; -- applied to
      plants producing fruit, animals producing young, etc.; --
      usually with the implied idea of frequent or numerous
      production; as, a prolific tree, female, and the like.

   2. Serving to produce; fruitful of results; active; as, a
      prolific brain; a controversy prolific of evil.

   3. (Bot.) Proliferous.

Source : WordNet®

prolific
     adj 1: intellectually productive; "a prolific writer"; "a fecund
            imagination" [syn: {fecund}, {fertile}]
     2: bearing in abundance especially offspring; "flying foxes are
        extremely prolific"; "a prolific pear tree" [syn: {fertile}]