IPA: /ˈmɛləˌnɪzəm/
KK: /mɛləˌnɪzəm/
The condition of having dark coloration in the skin, hair, fur, or feathers due to a high level of melanin.
The black panther is a well-known example of melanism in big cats.
Melanism is formed from "melas" (μέλας) (meaning black) and "-ism" (meaning a condition or state). The term describes a condition characterized by an increased amount of black pigmentation in an organism.
Think of 'melas' meaning black, which helps you remember that melanism refers to a condition of increased black pigmentation.