gules
Concise Oxford English Dictionary © 2008 Oxford University Press:
gules /gjuːlz/
▶noun red, as a heraldic tincture.
– origin ME: from OFr. goles (pl. of gole ‘throat’, from L. gula), used to denote pieces of red-dyed fur used as a neck ornament.
'gules' also found in these Oxford entries:

