google
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late 19th century: from hypo- ‘below’ + glyco- + -aemia.
wiktionary
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hypo- + glycemia = hypo- + glyc- + -emia
etymonline
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hypoglycemia (n.)
1893, from Latinized form of Greek elements hypo- "under" (see hypo-) + glykys "sweet" (see glucose) + haima "blood" (see -emia).
