Words in english starting with O

• ovarian pregnancy — Noun – English ～ ectopic pregnancy in the ovary
• object of a preposition — Noun – English ～ the object governed by a preposition
• oral presentation — Noun – English ～ delivering an address to a public audience; "people came to see the candidates and hear the speechmaking"
• osmotic pressure — Noun – English ～ (physical chemistry) the pressure exerted by a solution necessary to prevent osmosis into that solution when it is separated from the pure solvent by a semipermeable membrane
• oil pressure — Noun – English ～ pressure that keeps oil on the moving parts of an internal-combustion engine
• offer price — Noun – English ～ (stock market) the price at which a broker is willing to sell a certain security
• open primary — Noun – English ～ a primary in which any registered voter can vote (but must vote for candidates of only one party)
• order Primates — Noun – English ～ an animal order including lemurs and tarsiers and monkeys and apes and human beings
• order Primulales — Noun – English ～ Primulaceae; Theophrastaceae; Myrsinaceae; and (in some classifications) Plumbaginaceae
• Ochotona princeps — Noun – English ～ North American pika
• out of print — Adjective – English ～ (of books) no longer offered for sale by a publisher; "that edition is out of print"
• offset printing — Noun – English ～ a plate makes an inked impression on a rubber-blanketed cylinder, which in turn transfers it to the paper
• optical prism — Noun – English ～ optical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an image
• order Proboscidea — Noun – English ～ an order of animals including elephants and mammoths
• operating procedure — Noun – English ～ a procedure for operating something or for dealing with a given situation
• order Procellariiformes — Noun – English ～ petrels; albatrosses; shearwaters; diving petrels
• open-hearth process — Noun – English ～ a process for making steel using an open-hearth furnace
• organic process — Noun – English ～ a process occurring in living organisms
• olecranon process — Noun – English ～ process of the ulna that forms the outer bump of the elbow and fits into the fossa of the humerus when the arm is extended
• odontoid process — Noun – English ～ a toothlike process at the back of 2nd vertebra of the neck

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