crimson
Concise Oxford English Dictionary © 2008 Oxford University Press:
crimson /ˈkrɪmz(ə)n/
▶noun a rich deep red colour. ▶verb become flushed, especially through embarrassment.
– origin ME: from obs. Fr. cramoisin or Old Sp. cremesin, based on Arab. ḳirmizī, from ḳirmiz (see kermes).
'crimson' also found in these Oxford entries:

