| altostratus | (noun) a stratus cloud at an intermediate altitude of 2 or 3 miles | Synonyms: altostratus cloud |
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| apostrophe | (noun) address to an absent or imaginary person | - |
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| (noun) the mark (') used to indicate the omission of one or more letters from a printed word | - |
| autostrada | (noun) an expressway in an Italian-speaking country | - |
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| cirrostratus | (noun) a thin uniform layer of hazy cloud at high altitude | Synonyms: cirrostratus cloud |
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| clostridia | (noun) spindle-shaped bacterial cell especially one swollen at the center by an endospore | Synonyms: clostridium |
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| clostridium | (noun) spindle-shaped bacterial cell especially one swollen at the center by an endospore | Synonyms: clostridia |
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| colostrum | (noun) milky fluid secreted for the first day or two after parturition | Synonyms: foremilk |
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| dihydrostreptomycin | (noun) antibiotic consisting of a hydrogenated form of streptomycin; used against tuberculosis and tularemia and Gram-negative organisms | - |
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| geostrategy | (noun) the branch of geopolitics dealing with strategy | - |
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| heterostracan | (noun) extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian | - |
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| nostril | (noun) either one of the two external openings to the nasal cavity in the nose | Synonyms: anterior naris |
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| nostrum | (noun) patent medicine whose efficacy is questionable | - |
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| (noun) hypothetical remedy for all ills or diseases; once sought by the alchemists | Synonyms: catholicon, cure-all, panacea |
| osteostracan | (noun) extinct jawless fish of the Devonian with armored head | Synonyms: cephalaspid |
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| ostracism | (noun) the act of excluding someone from society by general consent | - |
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| (noun) the state of being banished or ostracized (excluded from society by general consent) | Synonyms: banishment, Coventry |
| ostracod | (noun) tiny marine and freshwater crustaceans with a shrimp-like body enclosed in a bivalve shell | Synonyms: mussel shrimp, seed shrimp |
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| ostracoderm | (noun) extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic | - |
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| ostrich | (noun) fast-running African flightless bird with two-toed feet; largest living bird | Synonyms: Struthio camelus |
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| (noun) a person who refuses to face reality or recognize the truth (a reference to the popular notion that the ostrich hides from danger by burying its head in the sand) | - |
| paleostriatum | (noun) the inner pale yellow part of the lenticular nucleus | Synonyms: globus pallidus, pallidum |
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| prostration | (noun) the act of assuming a prostrate position | - |
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| (noun) abject submission; the emotional equivalent of prostrating your body | - |
| (noun) an abrupt failure of function or complete physical exhaustion | Synonyms: collapse |
| rostrum | (noun) beaklike projection of the anterior part of the head of certain insects such as e.g. weevils | Synonyms: snout |
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| (noun) a platform raised above the surrounding level to give prominence to the person on it | Synonyms: ambo, dais, podium, pulpit, soapbox, stump |