Words in english starting with O

• 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
• one-piece — Adjective – English ～ (of clothing) consisting of or fashioned in a single whole piece; "a one-piece garment"
• 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
• odd-pinnate — Adjective – English ～ (a leaf shape) pinnate 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
• os pisiforme — Noun – English ～ a small wrist bone that articulates only with the triquetral
• orchestra pit — Noun – English ～ lowered area in front of a stage where an orchestra accompanies the performers
• overhand pitch — Noun – English ～ a baseball pitch in which the hand moves above the shoulder
• out of place — Adjective – English ～ of an inappropriate or misapplied nature

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