(sciences) A zone or band; a layer.

A species of silverside fish (Atheriniformes), Bedotia geayi, from Madagascar, also called red-tailed silverside.

plural of zona

plural of zona

plural of Zona

A surname. / A female given name. / Short for Arizona. / An unincorporated community in Roane County, West Virginia.

(anatomy) A glycoprotein membrane surrounding the plasma membrane of an oocyte.

plural of zona pellucida

(anatomy) The innermost layer of the adrenal cortex, responsible for the production of precursor androgens including dehydroepiandrosterone and androstenedione from cholesterol.

(biology) A radiately striated membrane situated next to the yolk of an ovum, or separated from it by a very delicate membrane only.