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

combining form representing Latin plānus level, plānum level ground Unabridged


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

combining form representing Greek plános wandering, roaming. See planet Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
plano- or (sometimes before a vowel) plan-
combining form
indicating flatness or planeness: plano-concave
[from Latin plānus flat, level]
plan- or (sometimes before a vowel) plan-
combining form
[from Latin plānus flat, level]

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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American Heritage
Medical Dictionary

plano- or plani- or plan-
Flat: planocellular.

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