xanthene

noun

A yellow crystalline organic compound, C13H10O, that is soluble in ether and is used as a fungicide and in organic synthesis. The structural unit of xanthene is a feature in several fluorescent dyes.

noun

Orthomethylenediphenylene oxid; a colorless compound, , prepared by the action of aluminium chlorid on phenol. It crystallizes in plates, melts at 100.5° C., and boils at 315° C.

noun

any of a group of tricyclic heterocycles (dibenzopyrans) that are the basis for a range of dyes such as fluorescein and eosin