Nouns in english starting with O

• operative — Noun – English ～ a person secretly employed in espionage for a government
• operator — Noun – English ～ (mathematics) a symbol or function representing a mathematical operation
• operator — Noun – English ～ a shrewd or unscrupulous person who knows how to circumvent difficulties
• operator — Noun – English ～ a speculator who trades aggressively on stock or commodity markets
• operator — Noun – English ～ someone who owns or operates a business; "who is the operator of this franchise?"
• operator gene — Noun – English ～ a gene that activates the production of messenger RNA by adjacent structural genes
• operator — Noun – English ～ an agent that operates some apparatus or machine; "the operator of the switchboard"
• operculum — Noun – English ～ a hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retracted
• operetta — Noun – English ～ a short amusing opera
• operon — Noun – English ～ a segment of DNA containing adjacent genes including structural genes and an operator gene and a regulatory gene
• operoseness — Noun – English ～ the quality of requiring extended effort
• Opheodrys aestivus — Noun – English ～ of southern and eastern United States
• Opheodrys — Noun – English ～ North American green snakes
• Ophidia — Noun – English ～ snakes
• ophidian — Noun – English ～ limbless scaly elongate reptile; some are venomous
• Ophidiidae — Noun – English ～ eellike marine fishes
• ophidism — Noun – English ～ poisoning by snake venom
• Ophiodon elongatus — Noun – English ～ food fish of the northern Pacific related to greenlings
• Ophiodon — Noun – English ～ a genus of Ophiodontidae
• Ophiodontidae — Noun – English ～ fishes closely related to greenlings

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