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metro-1

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

combining form representing Greek métron measure

metro-2

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

Origin of metro-2

combining form representing Greek mḗtra womb

metro-3

  1. a combining form representing metropolis or metropolitan in compound words: metroflight; metroland; Metroliner.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for metro-

metro-1

before a vowel metr-

combining form
  1. indicating the uterusmetrorrhagia
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Word Origin

from Greek mētra womb

metro-2

combining form
  1. indicating a measuremetronome
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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

metro- in Medicine

metro-

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