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-.

< Greek makro-, combining form of makrós long; cognate with Latin macer lean; see meager

macro-, micro-. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
macro- or (before a vowel) macr-
combining form
1.  large, long, or great in size or duration: macroscopic
2.  Compare micro- (in pathology) indicating abnormal enlargement or overdevelopment: macrocyte
3.  producing larger than life images: macrophotography
[from Greek makros large; compare Latin macermeagre]
macr- or (before a vowel) macr-
combining form
[from Greek makros large; compare Latin macermeagre]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

comb. form meaning "long," from Gk. makros "long, large," from PIE base *mak-/*mek- "long, thin" (cf. L. macer "lean, thin;" O.N. magr, O.E. mæger "lean, thin;" Gk. mekos "length," makros "long").
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

macro- or macr-

  1. Large: macronucleus.

  2. Long: macrobiotic.

  3. Inclusive: macroamylase.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
A prefix meaning "large," as in macromolecule, a large molecule.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Related Words
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