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pro·lif·ic   
[pruh-lif-ik]
–adjective
1. producing offspring, young, fruit, etc., abundantly; highly fruitful: a prolific pear tree.
2. producing in large quantities or with great frequency; highly productive: a prolific writer.
3. profusely productive or fruitful (often fol. by in or of ): a bequest prolific of litigations.
4. characterized by abundant production: a prolific year for tomatoes.

Origin:
1640–50; < ML prōlificus fertile. See prolicide, -fic

—Related forms
pro·lif·i·ca·cy [pruh-lif-i-kuh-see]
pro·li·fic·i·ty [proh-luh-fis-i-tee]
pro·lif·ic·ness, noun
pro·lif·i·cal·ly, adverb
non·pro·lif·ic, adjective
non·pro·lif·ic·ness, noun
non·pro·lif·i·ca·cy, noun
non·pro·lif·i·cal·ly, adverb
o·ver·pro·lif·ic, adjective
o·ver·pro·lif·ic·ness, noun
o·ver·pro·lif·i·cal·ly, adverb
un·pro·lif·ic, adjective
un·pro·lif·ic·ness, noun
un·pro·lif·i·cal·ly, adverb

—Synonyms
1, 2. teeming, fecund, abundant. See productive.

—Antonyms
1. barren.