1. The pigmentation of the eye's iris
   "The genetics of eye colour, like hair colour, are still being worked out, and it's clear that several genes can modify the eventual outcome"; "The genetics of eye colour, like hair colour, are still being worked out, and it's clear that several genes can modify the eventual outcome.";
   - eye color [N. Amer]

Type of: color [US], coloring [US], colour [Brit, Cdn], colouring [Brit, Cdn]

Encyclopedia: Eye colour