Used attributively and in the possessive to designate a red stain consisting of an alcoholic solution of fuchsine in an aqueous solution of phenol.

Histology. Designating a biological stain consisting of an acid and a basic dye.

In the genitive and attributive. Designating a stain or staining technique typically including methylene blue and eosin, used on blood smears and…

Biology. Of a stain or dye: containing derivatives which differ in colours from the parent compound; esp. in polychrome methylene blue.

Histology. Of a stain or staining process: used or performed on viable cells or tissue removed from a living or recently dead organism.

Of biological stains or their use: used or carried out on living tissue. Cf. intra vitam n. at intra, prep. 2, intravital, adj.

= trichromatic, adj.; spec. applied to a stain and method of staining in which different kinds of tissue are stained in one or other of three…