fertilizeEnglishOxford American Thesaurusfertilize verb 1 the field is plowed up and fertilized: add fertilizer to, enrich with fertilizer, feed, mulch, compost, manure, dung, dress, top-dress; make more fertile; rare fecundate, fructify. 2 the eggs were fertilized during the breeding season: impregnate, inseminate; rare fecundate. 3 these orchids are fertilized by insects: pollinate, cross-pollinate, cross-fertilize, make fruitful; rare fecundate, fructify.