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Zona - 3 dictionary results
Zona
Zo"na\, n.; pl. Zon[ae]. [L., a girdle. See Zone.] A zone or band; a layer. 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.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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Main Entry: zo·na
Pronunciation: 'zO-n&
Function: noun
Inflected Form: plural zo·nae /-"nE also -"nI/ or zonas
1 : an anatomical zone or layer; especially : ZONA PELLUCIDA
2 : SHINGLES
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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zona zo·na (zō'nə)
n. pl. zo·nae (-nē)
- An encircling or beltlike anatomical structure. Also called segment, zone.
- See shingles.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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