gules (adj.)

"red," in heraldic descriptions, c. 1300, from Old French goules "neckpiece of (red) fur," plural of gole, guele "throat," from Latin gula "throat" (see gullet). Or perhaps the reference is to the red open mouth of the heraldic lion. Derivation from Persian gul "a rose" is "a poetical fancy" [Century Dictionary].

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