| arctan | (noun) the inverse function of the tangent; the angle that has a tangent equal to a given number | Synonyms: arc tangent, arctangent, inverse tangent |
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| arctangent | (noun) the inverse function of the tangent; the angle that has a tangent equal to a given number | Synonyms: arc tangent, arctan, inverse tangent |
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| arctic | (noun) a waterproof overshoe that protects shoes from water or snow | Synonyms: galosh, golosh, gumshoe, rubber |
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| arctiid | (noun) stout-bodied broad-winged moth with conspicuously striped or spotted wings; larvae are hairy caterpillars | Synonyms: arctiid moth |
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