English

acyanopia

From a- + cyano- + -opia.

Formed from a- + cyano- + -opia

Proto-Indo-European *uds- ‘up, out’

Proto-Germanic *uz- ‘out-’

Proto-West Germanic *uʀ- ‘up, out, over’

English a-

Proto-Hellenic *kúwanos

Ancient Greek κῠ́ᾰνος ‘dark-blue enamel’

Ancient Greek κυάνεος ‘dark blue’

Today it means

noun A form of color blindness: the inability to distinguish blue.

Language periods are conventional ranges, not dates for this word.

Etymograph / acyanopia