pro·lif·ic 
(prə-lĭfĭk)
(prə-lĭfĭk)adj.
1. Producing offspring or fruit in great abundance; fertile: a prolific variety of grape.
2. Producing or characterized by abundant works or results: a prolific artist; a prolific period in a writer's life. See Synonyms at fertile.
[French prolifique, from Medieval Latin prōlificus : Latin prōlēs, prōl-, offspring; see al-2 in the Appendix of Indo-European roots + Latin -ficus, -fic.]
pro·lifi·ca·cy (-ĭ-kə-sē), pro·lific·ness (-ĭk-nĭs) n.
pro·lifi·cal·ly adv.