Definition of protan in English:

protan

noun

Ophthalmology
  • Protanopia or protanomaly (now rare); a person affected by either of these conditions.

adjective

Ophthalmology
  • Of, relating to, or affected by protanopia or protanomaly; protanopic or protanomalous.

Origin

1940s. Partly shortened from protanopia, and partly shortened from protanomaly.

Pronunciation

protan

/ˈprəʊtən/