Nouns starting with O

• obstructive shock — Noun – English ～ shock caused by obstruction of blood flow
• open shop — Noun – English ～ a company whose workers are hired without regard to their membership in a labor union
• one shot — Noun – English ～ a charge of ammunition for a single shot
• otter shrew — Noun – English ～ amphibious African insectivorous mammal that resembles an otter
• opossum shrimp — Noun – English ～ shrimp-like crustaceans whose females carry eggs and young in a pouch between the legs
• ozone sickness — Noun – English ～ illness that can occur to persons exposed to ozone in high-altitude aircraft; characterized by sleepiness and headache and chest pains and itchiness
• open sight — Noun – English ～ rear gunsight having an open notch instead of a peephole or telescope
• output signal — Noun – English ～ signal that comes out of an electronic system
• order Siluriformes — Noun – English ～ an order of fish belonging to the superorder Malacopterygii including catfishes
• original sin — Noun – English ～ a sin said to be inherited by all descendants of Adam; "Adam and Eve committed the original sin when they ate the forbidden fruit in the Garden of Eden"
• oculus sinister — Noun – English ～ the left eye
• order Siphonaptera — Noun – English ～ fleas
• order Siphonophora — Noun – English ～ marine colonial hydrozoans
• order Sirenia — Noun – English ～ an animal order including: manatees; dugongs; Steller's sea cow
• orphan site — Noun – English ～ a toxic waste area where the polluter could not be identified or the polluter refused to take action or pay for the cleanup
• one-sixteenth — Noun – English ～ one part in sixteen equal parts
• one-sixth — Noun – English ～ one part in six equal parts
• one-sixtieth — Noun – English ～ one part in sixty equal parts
• one-sixty-fourth — Noun – English ～ one part in sixty-four equal parts
• Otis Skinner — Noun – English ～ United States actor (1858-1942)

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