metro

1 [me-troh]
noun, plural metros. (often initial capital letter)
1.
the underground electric railway of Paris, France, Montreal, Canada, Washington, D.C., and other cities.
2.
subway ( def 1 ).

Origin:
1900–05; < French métro, short for chemin de fer métropolitain metropolitan railroad

Dictionary.com Unabridged

metro

2 [me-troh] Informal.
adjective
1.
metropolitan ( defs 1, 2 ).
noun, plural metros.
2.
metropolis ( defs 1, 2 ).
3.
(often initial capital letter) Chiefly Canadian. the government or jurisdiction of a large city.

Origin:
1900–05; by shortening; or independent use of metro-3

metro-

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

Origin:
combining form representing Greek métron measure

metro-

2
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
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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Collins
World English Dictionary
metro or French métro (ˈmɛtrəʊ, metro)
 
n , pl -ros
an underground, or largely underground, railway system in certain cities, esp in Europe, such as that in Paris
 
[C20: from French, short for chemin de fer métropolitain metropolitan railway]
 
métro or French métro
 
n
 
[C20: from French, short for chemin de fer métropolitain metropolitan railway]

metro- or (before a vowel) metr-1
 
combining form
indicating the uterus: metrorrhagia
 
[from Greek mētra womb]
 
metr- or (before a vowel) metr-1
 
combining form
 
[from Greek mētra womb]

metro-2
 
combining form
indicating a measure: metronome
 
[from Greek metron measure]

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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Etymonline
Word Origin & History

Metro
Paris underground, 1904, from Fr. abbrev. of Chemin de Fer Métropolitain "Metropolitan Railway."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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Example sentences
Furthermore, conducting graduate work in an expensive metro area adds to the
  financial pressure.
Metro says that the restructuring of its food-retailing business is largely to
  blame for these thin figures.
Only now has it started work on an orbital motorway, more metro lines and
  improvements to the suburban railway.
Of course, there's a high degree of variance among the different cities in the
  metro area.
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