ˌ ̷ ̷ ̷ ̷ˈōpēə noun
( -s )
Etymology: New Latin, from trit- + anopia blindness, from a- (II) + -opia; from the fact that only 1/3 of the colors of the spectrum can be perceived by a tritanope
: dichromatism in which the spectrum is seen in tones of red and green — called also blue-yellow blindness