fertilize Definition

1. Said of a male gamete, especially a sperm cell: to fuse with (a female gamete, especially an egg cell) to form a zygote.
2. Said of a male animal: to inseminate or impregnate (a female animal).

Thesaurus: impregnate, breed, generate, fecundate, inseminate, propagate, procreate, beget.
3. Said of flowering and conebearing plants: to transfer (pollen) by the process of pollination.
4. To supply (soil or land) with extra nutrients in order to increase its fertility and improve the growth of crops or other plants on it.

Thesaurus: manure, compost, dress, top-dress, spread, lime, prepare, mulch, cover, treat, enrich.