- ovaryA female reproductive organ, often paired, that produces ova in most animals, and in mammals, secretes the hormones estrogen and progesterone.
- ovationA victory ceremony of less importance than a triumph.
- ovumThe female gamete in animals; the egg cell.
- ovuleThe structure in a plant that develops into a seed after fertilization; the megasporangium of a seed plant with its enclosing integuments.
- OvaltineA brand of milk flavoring product, usually made with malt extract, sugar, and whey.
- ovariousPertaining to or made up of eggs.
- ovicularOf, resembling, or pertaining to an egg.
- ovigerA leg, of some pycnogonids, that is modified to carry eggs
- oviscapeThe basal part of the ovipositor of some species of insects, typically the non-retractile sheath that remains exposed when the ovipositor is withdrawn and not in action.
- ovismThe belief that the ovum holds all material needed for the development of the embryo.
- ovistSomeone who believes that the complete embryo is contained preformed within the ovum; a proponent of ovism.
- ovo-egg; ovum
- ovoloA classical convex moulding carved with an egg and dart ornament.
- ovoviviparousOf or pertaining to such kind of animals such as some reptiles whose eggs hatch inside their body.
- ovulumAn ovum.
- tritovumAn embryonic insect which has twice cast its skin before hatching from the egg, such as some mites of Myobia