Late 19th century; earliest use found in Mind. From German Dichromat, back-formation from dichromatisch, with reinterpretation of -at- as a reflex of classical Latin -ātus.
Definition of dichromat in US English:
dichromat
(also dichromate)
nounˈdʌɪkrə(ʊ)mat
Physiology Ophthalmology
A person or animal exhibiting dichromacy.
Origin
Late 19th century; earliest use found in Mind. From German Dichromat, back-formation from dichromatisch, with reinterpretation of -at- as a reflex of classical Latin -ātus.