• synonyms


  1. a combining form meaning “flat,” “plane,” used in the formation of compound words: planography.
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Also plani-; especially before a vowel, plan-.

Origin of plano-1

combining form representing Latin plānus level, plānum level ground


  1. a combining form meaning “moving,” “capable of movement,” used in the formation of compound words: planogamete.
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Origin of plano-2

combining form representing Greek plános wandering, roaming. See planet
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for plano-


sometimes before a vowel plan-

combining form
  1. indicating flatness or planenessplano-concave
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Word Origin

from Latin plānus flat, level
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

Word Origin and History for plano-

alternative form of Latin plani- "flat, level," but also used in sciences as a comb. form of Greek planos "wandering" (see planet).

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Online Etymology Dictionary, © 2010 Douglas Harper

plano- in Medicine


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