piebaldism (n.), piebald (adj.)

https://doi.org/10.1351/goldbook.11091
Patchy absence of pigmentation of the hair or skin or, depending on the species, of feathers, scales, or other body surfaces.
Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 792 [Terms] [Paper]