Nouns starting with O

• order Phallales — Noun – English ～ order of fungi comprising the stinkhorns and related forms whose mature hymenium is slimy and fetid; sometimes placed in subclass Homobasidiomycetes
• oral phase — Noun – English ～ (psychoanalysis) the first sexual and social stage of an infant's development; the mouth is the focus of the libido and satisfaction comes from suckling and chewing and biting
• order Phasmatodea — Noun – English ～ in some classifications considered a suborder of Orthoptera: stick insects; leaf insects
• order Phasmida — Noun – English ～ in some classifications considered a suborder of Orthoptera: stick insects; leaf insects
• organic phenomenon — Noun – English ～ (biology) a natural phenomenon involving living plants and animals
• optical phenomenon — Noun – English ～ a physical phenomenon related to or involving light
• order Pholidota — Noun – English ～ pangolins; in some former classifications included in the order Edentata
• orinasal phone — Noun – English ～ a speech sound produced with both the oral and nasal passages open (as French nasal vowels)
• oxidative phosphorylation — Noun – English ～ an enzymatic process in cell metabolism that synthesizes ATP from ADP
• order Picariae — Noun – English ～ term used in some classifications as nearly equivalent to the order Coraciiformes
• order Piciformes — Noun – English ～ woodpeckers; jacamars; puffbirds; barbets; honey guides; toucans
• Oreortyx picta palmeri — Noun – English ～ California partridge; slightly larger than the California quail
• Oxylebius pictus — Noun – English ～ greenling with whitish body marked with black bands
• oral contraceptive pill — Noun – English ～ a contraceptive in the form of a pill containing estrogen and progestin to inhibit ovulation and so prevent conception
• orange mushroom pimple — Noun – English ～ a variety of mushroom pimple
• Oregon pine — Noun – English ～ lofty douglas fir of northwestern North America having short needles and egg-shaped cones
• odd-pinnate leaf — Noun – English ～ a pinnate leaf with a single leaflet at the apex
• organ pipe — Noun – English ～ the flues and stops on a pipe organ
• oil pipeline — Noun – English ～ a pipeline used to transport oil
• order Piperales — Noun – English ～ Piperaceae; Saururaceae; Chloranthaceae

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