fecund

1. (formal) Highly fertile; able to produce offspring.Examples: "The number of children per woman depends, as has been said, on biological and social factors which determine: (1) the frequency of births during a woman's fecund period, and (2) the portion of the fecund period--between puberty and menopause--effectively utilized for reproduction."; "The druids […] believed that mistletoe could make barren animals fecund, and that it was an antidote to all poisons."Synonyms: battle, childingformal

2. (figuratively) Leading to new ideas or innovation.Examples: "This idea of Aristotle's has proved marvellously fecund; and in truth it is the only idea covering quite the whole area of cenoscopy that has shown any marked uberosity."Synonyms: fertile, productive, prolificfiguratively