prolific

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Producing offspring or fruit in great abundance; fertile.
• adjective Producing or characterized by abundant works or results: synonym: fertile.

from The Century Dictionary.

• Producing young or fruit, especially in abundance; fruitful; fertile; productive in general: as, a prolific female; a prolific tree; prolific seed.
• Serving to give rise or origin; having the quality of generating: as, a controversy prolific of evil consequences; a prolific brain.
• Same as proliferous .

from the GNU version of the Collaborative International Dictionary of English.

• adjective 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.
• adjective Serving to produce; fruitful of results; active
• adjective (Bot.) Proliferous.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Fertile, producing offspring or fruit in abundance — applied to plants producing fruit, animals producing young, etc.
• adjective Similarly producing results or works in abundance

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective intellectually productive
• adjective bearing in abundance especially offspring