A cyclic compound that may be considered the formal parent of sugars with an oxygen bridge from carbon atoms 1–5 (the pyranoses).
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py·ran 'pī(ə)r-.an n either of two cyclic compounds C5H6O that contain five carbon atoms and one oxygen atom in the ring
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py·ran (piґran) a heterocyclic compound: It is the ring structure that forms the basis of the pyranoses.
Medical dictionary. 2011.