noun Pathology.
an abnormally low level of glucose in the blood.

1890–95; hypo- + glyc- + -emia

hypoglycemic, adjective
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World English Dictionary
hypoglycaemia or hypoglycemia (ˌhaɪpəʊɡlaɪˈsiːmɪə)
pathol an abnormally small amount of sugar in the blood
[C20: from hypo- + glyco- + -aemia]
hypoglycemia or hypoglycemia
[C20: from hypo- + glyco- + -aemia]
hypogly'caemic or hypoglycemia
hypogly'cemic or hypoglycemia

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1894, Latinized form of Gk. elements hypo- "under" (see sub-) + glykys "sweet" (see glucose) + haima "blood" (see -emia).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

hypoglycemia hy·po·gly·ce·mi·a (hī'pō-glī-sē'mē-ə)
An abnormally low concentration of glucose in the 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
hypoglycemia   (hī'pō-glī-sē'mē-ə)  Pronunciation Key 
An abnormally low level of sugar in the blood, most commonly caused by excessive doses of insulin in people with diabetes or by excessive ingestion of alcohol or certain other drugs. It can cause weakness, dizziness, disorientation, and, if prolonged, permanent brain damage.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It takes only a little of this toxin to send a dog into hypoglycemia-induced seizures and sometimes fatal liver failure.
Hypoglycemia is a common problem in critically ill or extremely low birthweight infants.
After being discharged a second time, she began having symptoms of hypoglycemia again.
It would seem that my undiagnosed pre-diabetic hypoglycemia was the cause of my panic attacks.
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