a combining form meaning “milk,” used in the formation of compound words: galactopoietic.
Also especially before a vowel, galact-.

Origin of galacto-

< Greek galakto-, combining form of galakt-, stem of gála milk Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for galacto-


before a vowel galact-

combining form

milk or milkygalactometer

Word Origin for galacto-

from Greek galakt-, gala
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

Medicine definitions for galacto-



The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.