- Biochemistry. a disaccharide, C12H22O11, present in milk, that upon hydrolysis yields glucose and galactose.
- a white, crystalline, sweet, water-soluble commercial form of this compound, obtained from whey and used in infant feedings, in confections and other foods, in bacteriological media, and in pharmacology as a diluent and excipient.
Origin of lactose
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for lactose
Control of casein or lactose, on the contrary, is not nearly so practicable.The Book of Cheese
Charles Thom and Walter Warner Fisk
Levulose, lactose, and some others are occasionally met with.A Manual of Clinical Diagnosis
James Campbell Todd
These are all characteristic reactions of lactose or milk sugar.
Lactose exists in milk and has the same formula as cane-sugar.Encyclopedia of Diet
The lactose is converted into lactic acid by means of a special ferment.A Practical Physiology
Albert F. Blaisdell
- a white crystalline disaccharide occurring in milk and used in the manufacture of pharmaceuticals and baby foods. Formula: C 12 H 22 O 11Also called: milk sugar
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for lactose
Online Etymology Dictionary, © 2010 Douglas Harper
- A disaccharide in milk that hydrolyzes to yield glucose and galactose.milk sugar
- A white crystalline substance obtained from whey and used in infant foods and in pharmaceuticals as a diluent and excipient.milk sugar
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- A white crystalline disaccharide consisting of a glucose and a galactose molecule, found in milk and used in the manufacture of various other foods. Chemical formula: C12H22O11.
- The inability to digest lactose properly is called lactose intolerance. It is caused by a deficiency of the enzyme lactase and marked by abdominal cramping and other symptoms after ingesting lactose.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.