a combining form meaning “large,” “long,” “great,” “excessive,” used in the formation of compound words, contrasting with micro-: macrocosm; macrofossil; macrograph; macroscopic.
Also especially before a vowel, macr-.
Origin of macro-
< Greek makro-, combining form of makrós long; cognate with Latin macer lean; see meager
Can be confusedmacro- micro-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for macro-
before a vowel macr-
large, long, or great in size or durationmacroscopic
(in pathology) indicating abnormal enlargement or overdevelopmentmacrocyte Compare micro- (def. 5)
producing larger than life imagesmacrophotography
Word Origin for macro-
from Greek makros large; compare Latin macer meagre
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 macro-
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Science definitions for macro-
A prefix meaning large, as in macromolecule, a large molecule.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.