D defs.my
Entry 1 sense Webster, 1913

Gules

/(gūlz)/ · IPA /ˈɡjulz/
01 n. The tincture red, indicated in seals and engraved figures of escutcheons by parallel vertical lines. Hence, used poetically for a red color…
  1. 1.
    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.(Her.)
    “His sev'n-fold targe a field of gules did stain In which two swords he bore; his word, “Divide and reign.”” — P. Fletcher.
    “Follow thy drum; With man's blood paint the ground; gules, gules.” Shak.
    “Let's march to rest and set in gules, like suns.” Beau. & Fl.