1A compound formed by the reduction of fluorescein.
Fluorescin differs from fluorescein in having an oxygen atom replaced by a hydroxyl group, OH, and a carbon atom replaced by a CH group. Formula: C20H14O5..
2= fluorescein.
Origin
Late 19th century; earliest use found in Journal of the Chemical Society. From German Fluorescin from fluoresc- (in Fluorescenz, fluoresciren) + -in.