| ogdoad | (noun) the cardinal number that is the sum of seven and one | Synonyms: 8, eight, eighter, eighter from Decatur, octad, octet, octonary, VIII |
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| ogee | (noun) a molding that (in section) has the shape of an S with the convex part above and the concave part below | Synonyms: cyma reversa |
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| ogive | (noun) front consisting of the conical head of a missile or rocket that protects the payload from heat during its passage through the atmosphere | Synonyms: nose cone |
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| ogle | (verb) look at with amorous intentions | Synonyms: perv, perve |
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| ogler | (noun) a viewer who gives a flirtatious or lewd look at another person | - |
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| ogre | (noun) (folklore) a giant who likes to eat human beings | - |
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| (noun) a cruel wicked and inhuman person | Synonyms: demon, devil, fiend, monster |
| ogress | (noun) (folklore) a female ogre | - |
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