Nouns in english starting with O

• opium — Noun – English ～ an addictive narcotic extracted from seed capsules of the opium poppy
• opium den — Noun – English ～ a building where opium is sold and used
• opium addict — Noun – English ～ someone addicted to opium
• opopanax — Noun – English ～ an odorous gum resin formerly used in medicines
• oporto — Noun – English ～ port city in northwest Portugal; noted for port wine
• opossum — Noun – English ～ small furry Australian arboreal marsupials having long usually prehensile tails
• opossum — Noun – English ～ nocturnal arboreal marsupial having a naked prehensile tail found from southern North America to northern South America
• oppenheimer — Noun – English ～ United States physicist who directed the project at Los Alamos that developed the first atomic bomb (1904-1967)
• opponent — Noun – English ～ a contestant that you are matched against
• opponent — Noun – English ～ someone who offers opposition
• opportuneness — Noun – English ～ timely convenience
• opportunism — Noun – English ～ taking advantage of opportunities without regard for the consequences for others
• opportunist — Noun – English ～ a person who places expediency above principle
• opportunistic infection — Noun – English ～ any infection caused by a microorganism that does not normally cause disease in humans; occurs in persons with abnormally functioning immune systems (as AIDS patients or transplant patients receiving immunosuppressive drugs)
• opportunity — Noun – English ～ a possibility due to a favorable combination of circumstances; "the holiday gave us the opportunity to visit Washington"; "now is your chance"
• opportunity cost — Noun – English ～ cost in terms of foregoing alternatives
• opposer — Noun – English ～ someone who offers opposition
• opposite — Noun – English ～ a word that expresses a meaning opposed to the meaning of another word, in which case the two words are antonyms of each other; "to him the antonym of `gay' was `depressed'"
• opposite — Noun – English ～ something inverted in sequence or character or effect; "when the direct approach failed he tried the inverse"
• opposite — Noun – English ～ a relation of direct opposition; "we thought Sue was older than Bill but just the reverse was true"

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