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In page Galactose:

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The word galactose was coined by Charles Weissman[citation needed] in the mid-19th century and is derived from Greek γάλακτος, galaktos 'of milk', and the generic chemical suffix for sugars -ose.[1] The etymology is comparable to that of the word lactose in that both contain roots meaning "milk sugar". Lactose is a disaccharide of galactose plus glucose.