ZONA • DICTIONARY ONE.COM • Definition of Zona

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noun

Zona n. (pl. zonae) A zone or band; a layer.

Zona pellucida. (Biol.)

(a)

The outer transparent layer, or envelope, of the ovum. It is a more or less elastic membrane with radiating striae, and corresponds to the cell wall of an ordinary cell.

(b)

The zona radiata.

Zona radiata (Biol.), a radiately striated membrane situated next the yolk of an ovum, or separated from it by a very delicate membrane only.

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Etymology of 'Zona'

Collaborative International Dictionary of English 0.48

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"Zona" Quotes from Famous Books

... et esmandis;" and another of 1366: "Duas zonas de serico, argento stofatas et Membratas." The term was thus used also in England, as in the inventory of valuables belonging to Edward I. in 1300 (Liber Garderobae, p. 347.):—"Una zona, cum cathenis argenti annell' cum targ' et membris argenti." It might be supposed from this expression, that the membra were, strictly speaking, the transverse bars of metals, or cloux, Fr., by which the girdle was divided ...

— Notes & Queries, No. 41, Saturday, August 10, 1850 • Various

Words linked to "Zona" : zone, zona pellucida, complex body part, zonula, bodily structure, body structure, general anatomy, zonule, structure, anatomical structure, anatomy