Etymology
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Words related to glyco-

gluco- 

before vowels, gluc-, word-forming element used since c. 1880s, a later form of glyco-, from Greek glykys "sweet," figuratively "delightful; dear; simple, silly," from *glku-, a dissimilation in Greek from PIE root *dlk-u- "sweet" (source also of Latin dulcis). De Vaan writes that "It is likely that we are dealing with a common borrowing from an unknown source." Now usually with reference to glucose.

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glycemia (n.)
also glycaemia, "presence or level of sugar in the blood," 1901, from glyco- "sugar" + -emia "condition of the blood."
glycerin (n.)

also glycerine, thick, colorless syrup, 1838, from French glycérine, coined by French chemist Michel-Eugène Chevreul (1786-1889), from glycero- "sweet" (see glyco-) + chemical ending -ine (2). So called for its sweet taste. Still in popular use, but in chemistry the substance now is known as glycerol.

glycogen (n.)
starch-like substance found in the liver and animal tissue, 1860, from French glycogène, "sugar-producer," from Greek-derived glyco- "sweet" (see glyco-) + French -gène (see -gen). Coined in 1848 by French physiologist Claude Bernard (1813-1878).
glycolysis (n.)
1891, from French; see glyco- + -lysis.