[fruhk-tohs, frook-, frook-]
Chemistry, Pharmacology. a yellowish to white, crystalline, water-soluble, levorotatory ketose sugar, C 6 H 12 O 6 , sweeter than sucrose, occurring in invert sugar, honey, and a great many fruits: used in foodstuffs and in medicine chiefly in solution as an intravenous nutrient.
Also called levulose, fruit sugar.

1860–65; fruct- + -ose2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fructose (ˈfrʌktəʊs, -təʊz, ˈfrʊk-)
laevulose, Also called: fruit sugar a white crystalline water-soluble sugar occurring in honey and many fruits. Formula: C6H12O6
[C19: from Latin frūctus fruit + -ose²]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"sugar found in fruit," 1864, coined in Eng. from L. fructus (see fruit) + chemical suffix -ose.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

fructose fruc·tose (frŭk'tōs', fruk'-)
A very sweet sugar occurring in many fruits and honey and used as a preservative for foodstuffs and as an intravenous nutrient. Also called fruit sugar, levulose.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
fructose   (frŭk'tōs')  Pronunciation Key 
A simple sugar (monosaccharide) found in honey, many fruits, and some vegetables. Fructose linked to glucose is the structure of table sugar, or sucrose. Fructose is an important source of energy for cellular processes. Chemical formula: C6H12O6.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Photosynthesis generates sucrose, or table sugar, which is broken down into
  glucose and the sweeter fructose during ripening.
Corn for ethanol has already raised the cost of grain feed and high fructose
  corn syrup.
High-fructose corn syrup is corn syrup treated with amylase and other enzymes,
  which together help convert glucose into fructose.
Maybe they would accept a huge donation from a producer of high fructose corn
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