Search Result for "colour blindness":
Wordnet 3.0

NOUN (1)

1. genetic inability to distinguish differences in hue;
[syn: color blindness, colour blindness, color vision deficiency, colour vision deficiency]



WordNet (r) 3.0 (2006):

colour blindness
    n 1: genetic inability to distinguish differences in hue [syn:
         color blindness, colour blindness, color vision
         deficiency, colour vision deficiency]