Nouns starting with O that are validated

• Oligochaeta — Noun – English ～ earthworms
• oligochaete — Noun – English ～ hermaphroditic terrestrial and aquatic annelids having bristles borne singly along the length of the body
• oligoclase — Noun – English ～ any of a series of triclinic feldspars that form rocks
• oligodactyly — Noun – English ～ congenital condition in which some fingers or toes are missing
• oligodendria — Noun – English ～ tissue consisting of glial cells with sheetlike processes that form the myelin sheath of nerve fibers
• oligodendrocyte — Noun – English ～ a cell of the oligodendroglia
• oligodendroglia — Noun – English ～ tissue consisting of glial cells with sheetlike processes that form the myelin sheath of nerve fibers
• oligodontia — Noun – English ～ congenital condition in which some of the teeth are missing
• oligomenorrhea — Noun – English ～ abnormally light or infrequent menstruation
• oligonucleotide — Noun – English ～ (biochemistry) a polynucleotide whose molecules contain relatively few nucleotides
• Oligoplites — Noun – English ～ leatherjackets
• oligopoly — Noun – English ～ (economics) a market in which control over the supply of a commodity is in the hands of a small number of producers and each one can influence prices and affect competitors
• Oligoporus — Noun – English ～ a genus of fungi belonging to the family Polyporaceae
• Oligoporus leucospongia — Noun – English ～ a pore fungus with a whitish cottony soft cap found on conifer logs in forests at high elevation in the western United States and adjacent Canada
• oligosaccharide — Noun – English ～ any of the carbohydrates that yield only a few monosaccharide molecules on complete hydrolysis
• oligospermia — Noun – English ～ insufficient spermatozoa in the semen
• oliguria — Noun – English ～ abnormally small production of urine; can be a symptom of kidney disease or obstruction of the urinary tract or edema or an imbalance of fluids and electrolytes in the body
• oliguria — Noun – English ～ production of an abnormally small amount of urine
• Olimbos — Noun – English ～ a mountain peak in northeast Greece near the Aegean coast; believed by ancient Greeks to be the dwelling place of the gods (9,570 feet high)
• olive brown — Noun – English ～ a shade of brown tinged with green

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