LATIN DICTIONARYLexicon Latīnum
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“prolific” in Latin

The English word prolific itself goes back to Latin prōlēs, through prōlificus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

prolific
PROP., (of land, etc.) fertilis; fecundus; uber; ferax (usually with a genitive, rarely with ablative; Cic. uses it almost always figuratively): fructuosus; frugifer: (of animals) fecundus; multos partus, fetus, edens.
Figuratively, ferax; copiosus; fecundus; uber. SYN. and PHR. in FERTILE, FRUITFUL].

Quick answer

What is the Latin word for prolific?
The usual Latin words for “prolific” are fertilis, fēcundus, ūber; also ferāx, frūctuōsus, frūgifer. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.