
Vitrina is genus of small air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Vitrinidae, the glass snails. Species with the genus Vitrina include: ...
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http://en.wikipedia.org/wiki/Vitrina

• (n.) A genus of terrestrial gastropods, having transparent, very thin, and delicate shells, -- whence the name.
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http://thinkexist.com/dictionary/meaning/vitrina/

(from the article `gastropod`) ...improve. They hibernate during winter periods, when water is locked into snow or ice, and estivate during periods of summer drought. Land snails ...
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http://www.britannica.com/eb/a-z/v/31
Vi·tri'na noun [ New Latin , from Latin
vitrum glass.]
(Zoology) A genus of terrestrial gastropods, having transparent, very thin, and delicate shells, -- whence the name.
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http://www.encyclo.co.uk/webster/V/31

Vitrina is a genus of pulmonate gastropods, in which the shell is thin, depressed and small, so that it is incapable of lodging the whole of the animal's body.
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http://www.probertencyclopaedia.com/browse/BV.HTM

vitrina 1. A translucent material resembling glass. 2. A genus of terrestrial gastropods, having transparent, very thin, and delicate shells; similar to appearance of glass.
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http://www.wordinfo.info/words/index/info/view_unit/2316/3
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