redness

noun
🔊/ˈrednəs/
🔊/ˈrednəs/
[uncountable, singular]
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  1. the fact of being red in colour, especially in a part of the body that is painful or swollen (= larger or rounder than normal)
    • You may notice redness and swelling after the injection.注射后可能会出现红肿。🔊🔊
    Topics Colours and Shapesb2