idiopt
/ˈɪdɪɒpt/rare. Now historical
noun
W. Whewell's term for: a person who is colour-blind.
- The term was objected to on various grounds, notably as being too similar to idiot..
Origin
Mid 19th century; earliest use found in William Whewell (1794–1866), college head and writer on the history and philosophy of science. From ancient Greek ἴδιος peculiar + -οπτος, used in words relating to sight. Perhaps compare earlier epopt.