orcein

(redirected from orcein-Giemsa stain)
Also found in: Medical.

orcein

(ˈɔːsɪɪn)
n
(Elements & Compounds) a brown crystalline material formed by the action of ammonia on orcinol and present in orchil: used as a dye, biological stain, and antiseptic. Formula: C28H24O7N2
[C19: see orcinol]