| covariance | (noun) (statistics) the mean value of the product of the deviations of two variates from their respective means | - |
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| covariation | (noun) (statistics) correlated variation | - |
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| ovariectomy | (noun) surgical removal of one or both ovaries | Synonyms: oophorectomy |
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| ovaritis | (noun) inflammation of the ovaries | - |
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| ovary | (noun) (vertebrates) one of usually two organs that produce ova and secrete estrogen and progesterone | - |
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| (noun) the organ that bears the ovules of a flower | - |
| pseudovariola | (noun) a mild form of smallpox caused by a less virulent form of the virus | Synonyms: alastrim, Cuban itch, Kaffir pox, milk pox, pseudosmallpox, variola minor, West Indian smallpox, white pox |
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| samovar | (noun) a metal urn with a spigot at the base; used in Russia to boil water for tea | - |
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| tovarich | (noun) a comrade (especially in Russian communism) | Synonyms: tovarisch |
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| tovarisch | (noun) a comrade (especially in Russian communism) | Synonyms: tovarich |
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