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metro-1

1.
a combining form meaning “measure,” used in the formation of compound words:
metronome.
Origin
combining form representing Greek métron measure

metro-2

1.
a combining form meaning “uterus,” used in the formation of compound words:
metrorrhagia.
Also, especially before a vowel, metr-.
Origin
combining form representing Greek mḗtra womb

metro-3

1.
a combining form representing metropolis, or metropolitan, in compound words:
metroflight; metroland; Metroliner.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for metro-

metro-1

combining form
1.
indicating the uterus: metrorrhagia
Word Origin
from Greek mētra womb

metro-2

combining form
1.
indicating a measure: metronome
Word Origin
from Greek metron measure
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
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metro- in Medicine

metro- or metr-
pref.
Uterus: metritis.

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