A condition where different parts of the body have distinctly different colors, especially noticeable in eyes, hair, or skin patches.
From Greek hetero- (different) + chroma (color) + -ia (condition). Medical/biological term from 19th century describing color variation conditions.
Heterochromia iridis—different colored eyes—happens when you have different amounts of melanin in each eye, and it shows up in celebrities like David Bowie and Mila Kunis, though his was actually a dilated pupil, not true heterochromia!
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