pyran

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py·ran

 (pī′răn′)
n.
Either of two isomeric unsaturated compounds with the formula C5H6O, having a ring of five carbon atoms and one oxygen atom.
[pyrone, heterocyclic compound (pyr(o)- + -one) + -an.]
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.

pyran

(ˈpaɪræn; paɪˈræn)
n
(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)

n.
either of two compounds having the formula C5H6O, containing one oxygen and five carbon atoms arranged in a six-membered ring.
[1900–05; pyr(one) a heterocyclic ketone (< Greek pŷr fire + -one) + -an2]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Lee, Environmentally benign, one-pot synthesis of pyrans by domino Knoevenagel/6I-electrocyclization in water and application to natural products, Green.
SHORT COMMUNICATION - Determination of the pKa Values of Some 1,2,4-triazole Derivatives by the Quantum Chemical Methods
The pyrolysis of cellulose, depending on the burning temperature, can lead to different products such as anhydrous sugars at lower temperatures and furans, pyrans, and glycoaldehyde at higher temperatures [6].
Primary Investigation into the Occurrence of Hydroxymethylfurfural (HMF) in a Range of Smoked Products
For Dvorak, the longest such words going forwards have six letters, and there are 33 of them: CLOOTS, CLOUDS, CLOUTS, COOEED, COOEES, CREEDS, CROONS, CROUTS, FLEETS, FLOODS, FLOUTS, FLUIDS, FOEHNS, FRAUDS, FREETS, FREITS, FRITTS, FRUITS, GLEEDS, GLEETS, GLOUTS, GRAINS, GREEDS, GREENS, GREETS, GROINS, GROUTS, PLAIDS, PLAINS, PLAITS, PREENS, PYLONS, and PYRANS. Going backwards we can produce 34 six-letter words: DUALLY, KNAGGY, KNARRY, KNOLLY, MEALLY, QUAGGY, QUARRY, SHAGGY, SHEAFY, SHELFY, SHELLY, SHERRY, SHOALY, SNAGGY, SNEERY, SNELLY, SNIFFY, SNUFFY, STAGGY, STARRY, STEELY, STILLY, STUFFY, STUGGY, THEALL, THEORY, WHALLY, WHEELY, WHERRY, WHIFFY, WHILLY, WHIRRY, WHOLLY, and WOOLLY.
Dvorak typewriter words
The former group is further divided into monocyclic and bicyclic compounds (bicyclo[3.1.0], bicyclo[3.1.1], bicyclo[4.1.0], bicyclo[4.4.0] (naphthalenes), bicyclo[5.3.0] (azulenes)) and the latter into furans, pyrans, bicyclo[3.2.1], bicyclo[5.1.0], and spiro compounds.
Diversity and distribution of floral scent
PYRANS borosilicate fire-resistant glass at Hangar 7 is opening up a new dimension of transparent architecture in a format previously unattained in frameless glazing: the fire-resistant glass separates the two fire-protection compartments over a floor height of up to 3.40m.
Glass: Rob Gregory reviews new developments and applications of glass technology

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