blood sugar

noun
1.
glucose in the blood.
2.
the quantity or percentage of glucose in the blood.

Origin:
1925–30

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
blood sugar
 
n
med the glucose concentration in the blood: the normal fasting value is between 3.9 and 5.6 mmol/l

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

blood sugar n.

  1. See glucose.

  2. The concentration of glucose in the blood, measured in milligrams of glucose per 100 milliliters of blood.

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
blood sugar  
Sugar in the form of glucose in the blood. The concentration of blood sugar is measured in milligrams of glucose per 100 milliliters of blood.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
All fat and protein, won't spike your blood sugar at all.
Insulin is a hormone that helps the body turn blood sugar into energy.
One is the insulin receptor, or tiny cell structure, that controls levels of
  blood sugar.
As a result he's in constant danger of collapsing if his blood sugar levels
  fall beyond a certain point.
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