1. Intellectually productive
   "a prolific writer"
   - fecund, fertile 
2. Bearing in abundance especially offspring
   "flying foxes are extremely prolific"; "a prolific pear tree"
   - fertile

See also: fruitful, productive

• double crochet
• double cross
• double crème
• double dagger
• double damages
• double date
• double decomposition
• double decomposition reaction
• double digit
• double dipper
• double dipping
• double door
• double dribble
• double Dutch
• double dye
• double eagle
• double entendre
• double entry
• double fault
• double feature
• double first
• double flat
• double glazing
• double Gloucester
• double gold