1) Dyestuff 
1. <chemistry> Those molecules that are fluorescent when appropriately excited, fluorochromes such as fluorescein or tetramethyl rhodamine are usually used in their isothiocyanate forms (FITC, TRITC). ... 2. <microscopy> Dyes which have little colouring effect under ordinary lighting conditions but which fluoresce when irradiated with u...
(floor´o-krōm) a fluorescent compound, as a dye, used to mark protein with a fluorescent label.
Type: Term Pronunciation: flōr′ō-krōm Definitions: 1. Any fluorescent dye used to label or stain.
[n] - any of various fluorescent substances used in fluorescence microscopy to stain specimens
any of a group of fluorescent dyes used to label biological material.