supercrescence
/ˌsuːpəˈkrɛsns/ /ˌsjuːpəˈkrɛsns/Now rare
noun
A thing which grows over or on top of something else, a superficial growth; a living organism which grows on another, a parasite or epiphyte.
Origin
Mid 17th century; earliest use found in Thomas Browne (1605–1682), physician and author. From supercrescent: see -ence.