Nouns starting with O

• open secret — Noun – English ～ something that is supposed to be secret but is generally known; "their love affair was an open secret"
• Ozothamnus secundiflorus — Noun – English ～ shrub with white woolly branches and woolly leaves having fragrant flowers forming long sprays; flowers suitable for drying; sometimes placed in genus Helichrysum
• OTC security — Noun – English ～ a security traded in the over-the-counter market
• oil-rich seed — Noun – English ～ any of several seeds that yield oil
• order Selaginellales — Noun – English ～ in some classifications included in Lycopodiales
• olfactory sensation — Noun – English ～ the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form; "she loved the smell of roses"
• Onoclea sensibilis — Noun – English ～ beautiful spreading fern of eastern North America and eastern Asia naturalized in western Europe; pinnately divided fronds show a slight tendency to fold when touched; pinnules enclose groups of sori in beadlike lobes
• orderly sergeant — Noun – English ～ the first sergeant of a company; duties formerly included the conveyance of orders
• ordered series — Noun – English ～ an ordered reference standard; "judging on a scale of 1 to 10"
• Ochna serrulata — Noun – English ～ shrub with narrow-elliptic glossy evergreen leaves and yellow flowers with leathery petaloid sepals
• open sesame — Noun – English ～ a magical command; used by Ali Baba
• open sesame — Noun – English ～ any very successful means of achieving a result
• os sesamoideum — Noun – English ～ any of several small round bones formed in a tendon where it passes over a joint
• out-of-court settlement — Noun – English ～ resolution of a dispute prior to the rendering of a final decision by the trial court
• one-seventh — Noun – English ～ one part in seven equal parts
• oral sex — Noun – English ～ oral stimulation of the genitals; "they say he gives good head"
• oil shale — Noun – English ～ shale from which oil can be obtained by heating
• ordinary shares — Noun – English ～ stock other than preferred stock; entitles the owner to a share of the corporation's profits and a share of the voting power in shareholder elections; "over 40 million Americans invest in common stocks"
• Old English sheepdog — Noun – English ～ large sheepdog with a profuse shaggy bluish-grey-and-white coat and short tail; believed to trace back to the Roman occupation of Britain
• oyster shell — Noun – English ～ a shell of an oyster

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