red (redirected from saw red)

red (red)

1. the color produced by the longest waves of the visible spectrum, approximately 630 to 750 nm.

2. a dye or stain with this color.

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scarlet red  an azo dye used as a biological stain for fats.

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red,

adj in Chinese medicine, a facial coloration indicative of hot energy, poor digestion, and possible respiratory inflammation. See also energy, hot.

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red

the color at the lowest end of the visible spectrum; the color of blood.

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red dye

used in food coloring, reputed to reduce fertility.