Zona radiata


Zona radiata
Zona o"na, n.; pl. {Zon[ae]}. [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 stri[ae], 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. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • zona radiata — a thickened, rather complex egg membrane of teleost fishes, which often has a radiate appearance. It is formed at the surface of the egg by the ooplasm, or the ooplasm and the follicle cells and hence should be regarded as a true vitelline… …   Dictionary of ichthyology

  • Zona radiata — spindulinė sritis statusas T sritis šlapimo ir lyties aparatas atitikmenys: lot. Zona radiata ryšiai: platesnis terminas – kiaušidės folikulas …   Paukščių anatomijos terminai

  • zona radiata — see z. pellucida (def. 1) …   Medical dictionary

  • zona radiata — …   Useful english dictionary

  • Zona — o na, n.; pl. {Zon[ae]}. [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 stri[ae] …   The Collaborative International Dictionary of English

  • Zona pellucida — Zona o na, n.; pl. {Zon[ae]}. [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… …   The Collaborative International Dictionary of English

  • Zona pellucida — Menschliche Eizelle mit der sie als weißer Gürtel umgebenden Zona pellucida, welche ihrerseits in die Corona radiata eingebettet ist. Die Zona pellucida oder Glashaut ist eine Schutzhülle um die Eizelle (Ovozyte), die von den kubischen… …   Deutsch Wikipedia

  • Zona pellucida — Infobox Anatomy Name = PAGENAME Latin = GraySubject = 3 GrayPage = 38 Caption = Caption2 = Human ovum. The zona pellucida is seen as a thick clear girdle surrounded by the cells of the corona radiata. Precursor = System = Artery = Vein = Nerve =… …   Wikipedia

  • zona — 1. SYN: zone. 2. SYN: herpes zoster. [L. fr. G. zone, a girdle, one of the zones of the sphere] z. arcuata SYN: arcuate zone. z. ciliaris SYN: ciliary zone. z. corona SYN: costal fringe. z. dermatica a rid …   Medical dictionary

  • Zona pellucida — The strong membrane that forms around an ovum as it develops in the ovary. The membrane remains in place during the egg’s travels through the fallopian tube. To fertilize the egg, a sperm must penetrate the thinning zona pellucida. If… …   Medical dictionary


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