Fertilize \Fer"ti*lize\, v. t. [imp. & p. p. {Fertilized}; p. pr. & vb. n. {Fertilizing}.] [Cf. F. fertiliser.] 1. To make fertile or enrich; to supply with nourishment for plants; to make fruitful or productive; as, to fertilize land, soil, ground, and meadows. And fertilize the field that each pretends to gain. --Byron. 2. To fecundate; as, to fertilize flower. --A. R. Wallace.