zona

HYPHEN

Zo=na

top

WORDNET DICTIONARY

Noun zona has 1 sense

zona(n = noun.body) zone - (anatomy) any encircling or beltlike structure;

is a kind of anatomical structure, bodily structure, body structure, complex body part, structure

has particulars: zona pellucida, zonula, zonule

top

CIDE DICTIONARY

zona, n. [L., a girdle. See Zone.].

A zone or band; a layer. [1913 Webster]

Zona pellucida. [NL.] (Biol.) (a) The outer transparent layer, or envelope, of the ovum. It is a more or less elastic membrane with radiating striæ, and corresponds to the cell wall of an ordinary cell. See Ovum, and Illust. of Microscope. (b) The zona radiata. -- Zona radiata [NL.] (Biol.), a radiately striated membrane situated next the yolk of an ovum, or separated from it by a very delicate membrane only.