flowerflow‧er1 /ˈflaʊɚ/ ●●● noun [countable] 1 science, biology the colored part of a plant or tree that produces the seeds or fruit: The tree has beautiful pink flowers in early spring.2a small plant that produces beautiful flowers: She’s growing vegetables and flowers in the garden. a bouquet of flowers3in flower a plant that is in flower has flowers on it [Origin: 1100–1200 Old French flor, flour, from Latin flos]