from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The quality of having two independent channels for conveying color information in the eye.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision)
di- + Ancient Greek χρῶμα (khrōma, "color"). (Wiktionary)