Nouns in english starting with O

• Orcus — Noun – English ～ (Roman mythology) god of the underworld; counterpart of Greek Hades
• Orczy — Noun – English ～ British writer (born in Hungary) (1865-1947)
• ordainer — Noun – English ～ a cleric who ordains; a cleric who admits someone to holy orders
• ordeal — Noun – English ～ a primitive method of determining a person's guilt or innocence by subjecting the accused person to dangerous or painful tests believed to be under divine control; escape was usually taken as a sign of innocence
• ordeal — Noun – English ～ a severe or trying experience
• ordeal bean — Noun – English ～ dark brown highly poisonous seed of the calabar-bean vine; source of physostigmine and used in native witchcraft
• open order — Noun – English ～ a military formation leaving enough space between ranks to allow an inspecting officer to pass
• order Charadriiformes — Noun – English ～ large diverse order of aquatic birds found along seacoasts and inland waters: shorebirds and coastal diving birds; most feed on anima life
• order Opiliones — Noun – English ～ harvestmen
• order Euphausiacea — Noun – English ～ small commonly luminescent crustaceans; important element of marine plankton: krill
• order Myxosporidia — Noun – English ～ an order in the subclass Cnidosporidia
• order-Chenopodiales — Noun – English ～ corresponds approximately to the older group Centrospermae
• order Galliformes — Noun – English ～ pheasants; turkeys; grouse; partridges; quails; chickens; brush turkeys; curassows; hoatzins
• order Octopoda — Noun – English ～ octopuses and paper nautilus
• order Anacanthini — Noun – English ～ at least partially equivalent to the order Gadiformes in some classifications
• order Haemosporidia — Noun – English ～ an order in the subclass Telosporidia
• order Falconiformes — Noun – English ～ chiefly diurnal carnivorous birds having hooked beaks and long talons with opposable hind toe: falcons; hawks; eagles; ospreys; caracaras; vultures
• order Cestida — Noun – English ～ ctenophore having short tentacles; one family
• order Aristolochiales — Noun – English ～ order of plants distinguished by tubular petaloid perianth and inferior ovary
• order Hypermastigina — Noun – English ～ cellulose-producing flagellates

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