eosin-, eosino- +

(Greek: daybreak, dawn, red of the dawn sky; primarily used in naming chemical compounds, especially pertaining to red stain or dye)

eosin
Any of several synthetic dyes, including bluish and yellow ones.

They are used to stain tissues for microscopic examinations.

eosinopenia
The presence of eosinophils in an abnormally small number in the peripheral bloodstream; hypoeosinophilia.
eosinotactic
Attracting or repulsing eosinophilic cells.