gules
/ɡjuːlz
/noun [mass noun]
Red, as a heraldic tincture: [postpositive]: sword and long cross gules...
- He bore a shield of silver, stencilled with gules.
- Red (‘gules’) can be any shade of red, but cannot be replaced by another colour.
Origin
Middle English: from Old French goles (plural of gole 'throat', from Latin gula), used to denote pieces of red-dyed fur used as a neck ornament.