As an adjective, red describes the color of blood, ripe strawberries, and many stop signs. As a noun, it refers to this color itself.
From Old English *rēad*, from Proto-Germanic *rauthaz*, related to many Indo-European words for red. It is one of the oldest color words in human languages.
Red is so ancient as a word that almost every language has a version of it. Our brains are wired to notice red quickly—it signals blood, danger, and ripe fruit all at once, which mattered a lot for survival.
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