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Of a red hue.
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(of hair) Having an orange-brown or orange-blond colour; ginger.
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(of the skin) Having a redder hue than usual due to embarrassment, anger, sunburn, etc.; flushed.
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(of a dog or its coat) Having a brown color.
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(card games, of a card) Of the hearts or diamonds suits. Compare black (“of the spades or clubs suits”)
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(politics, often capitalized) Supportive of, related to, or dominated by a political party or movement represented by the color red:
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(chiefly derogatory, offensive) Amerind; relating to Amerindians or First Nations
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(astronomy) Of the lower-frequency region of the (typically visible) part of the electromagnetic spectrum which is relevant in the specific observation.
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(particle physics) Of a red color charge.