Gules (gūlz), n. [OE. goules, F. gueules, the same word as gueule throat, OF. gole, goule, L. gula. So named from the red color of the throat. See Gullet, and cf. Gula.] (Her.) The tincture red, indicated in seals and engraved figures of escutcheons by parallel vertical lines. Hence, used poetically for a red color or that which is red.

His sev'n-fold targe a field of gules did stain
In which two swords he bore; his word,
"Divide and reign."

Follow thy drum;
With man's blood paint the ground; gules, gules.

Let's march to rest and set in gules, like suns.

• (tincture): A red colour on a coat of arms, represented in engraving by vertical parallel lines.
  
• (tincture): In blazon, of the colour red.
       *The symbol of the Red Cross is a cross gules.