ovulePronunciation: /ˈɒvjuːl, ˈəʊ-/Definition of ovule noun Botany the part of the ovary of seed plants that contains the female germ cell and after fertilization becomes the seed. Derivatives ovular adjective Origin: early 19th century: from French, from medieval Latin ovulum, diminutive of ovumovule in other Oxford dictionaries Definition of ovule in the US English dictionary