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Related to pyran: Pyrantel pamoate
Either of two isomeric unsaturated compounds with the formula C5H6O, having a ring of five carbon atoms and one oxygen atom.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Elements & Compounds) an unsaturated heterocyclic compound having a ring containing five carbon atoms and one oxygen atom and two double bonds. It has two isomers depending on the position of the saturated carbon atom relative to the oxygen
[C20: from pyro- + -an]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
py•ran(ˈpaɪ ræn, paɪˈræn)
either of two compounds having the formula C5H6O, containing one oxygen and five carbon atoms arranged in a six-membered ring.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.