ˌ ̷ ̷ ̷ ̷ˈfəs ə n, -ˈfyüs ə n noun
( -s )
Etymology: International Scientific Vocabulary lip- + fuscin, a brown animal pigment, from Latin fuscus dark brown, blackish + International Scientific Vocabulary -in — more at dusk
: any of several brown pigments that are similar to the melanins and are found in various tissues (as of the heart) in a state of exhaustion or of senility