Nouns in english starting with O

• Osmerus — Noun – English ～ type genus of the Osmeridae
• osmiridium — Noun – English ～ a hard and corrosion resistant mineral that is a natural alloy of osmium and iridium (usually containing small amounts of rhodium and platinum); used in needles and pen nibs etc.
• Osmitrol — Noun – English ～ a diuretic (trade name Osmitrol) used to promote the excretion of urine
• osmium — Noun – English ～ a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known
• osmoreceptor — Noun – English ～ sensory end organ that responds to changes in osmotic pressure
• osmosis — Noun – English ～ (biology, chemistry) diffusion of molecules through a semipermeable membrane from a place of higher concentration to a place of lower concentration until the concentration on both sides is equal
• osmund — Noun – English ～ any fern of the genus Osmunda: large ferns with creeping rhizomes; naked sporangia are on modified fronds that resemble flower clusters
• Osmunda clatonia — Noun – English ～ North American fern having tall erect pinnate fronds and a few sporogenous pinnae at or near the center of the fertile fronds
• Osmunda cinnamonea — Noun – English ～ New World fern having woolly cinnamon-colored spore-bearing fronds in early spring later surrounded by green fronds; the early uncurling fronds are edible
• Osmundaceae — Noun – English ～ large family of ferns widely distributed in temperate and tropical areas
• osprey — Noun – English ～ large harmless hawk found worldwide that feeds on fish and builds a bulky nest often occupied for years
• osseous labyrinth — Noun – English ～ cavity in the petrous part of the temporal bone that contains the membranous labyrinth
• Ossete — Noun – English ～ a northeastern Iranian language spoken in Russia
• ossicle — Noun – English ～ a small bone; especially one in the middle ear
• ossiculum — Noun – English ～ a small bone; especially one in the middle ear
• ossification — Noun – English ～ the developmental process of bone formation
• ossification — Noun – English ～ hardened conventionality
• ossification — Noun – English ～ the process of becoming rigidly fixed in a conventional pattern of thought or behavior
• ossification — Noun – English ～ the calcification of soft tissue into a bonelike material
• osso buco — Noun – English ～ sliced veal knuckle or shin bone cooked with olive oil and wine and tomatoes and served with rice or vegetables

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