
Pyranose is a collective term for carbohydrates that have a chemical structure that includes a six-membered ring consisting of five carbon atoms and one oxygen atom. The name derives from its similarity to the oxygen heterocycle pyran, but the pyranose ring does not have double bonds. A pyranose in which the anomeric OH at C(l) has been converted ...
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http://en.wikipedia.org/wiki/Pyranose

a six-membered ring sugar molecule.
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http://www.chemistry-dictionary.com/definition/pyranose.php

<chemical> Sugar structure in which the carbonyl carbon is condensed with a hydroxyl group (i.e. In a hemi acetal link), forming a ring of five carbons and one oxygen. most hexoses exist in this form, although in sucrose, fructose is found with the smaller (four carbon) furanose ring. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973

(pir´ә-nōs) a six-membered ring structure formed by the reaction of the carbonyl group and a hydroxy group of a sugar to form a hemiacetal.
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Sugar structure in which the carbonyl carbon is condensed with a hydroxyl group (ie. in a hemi-acetal link), forming a ring of five carbons and one oxygen. Most hexoses exist in this form, although in sucrose, fructose is found with the smaller (four carbon) furanose ring.
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Type: Term Pronunciation: pī′ră-nōs Definitions: 1. A six-membered-ring sugar in the form of a six-membered ring in which the oxygen bridge forms a pyran.
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http://www.medilexicon.com/medicaldictionary.php?t=74463

any monosaccharide having a pyran ring structure.
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https://www.infoplease.com/dictionary/pyranose
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