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plano-1

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

plano-2

1.
a combining form meaning “moving,” “capable of movement,” used in the formation of compound words:
planogamete.
Origin
combining form representing Greek plános wandering, roaming. See planet
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for plano-

plano-

combining form
1.
indicating flatness or planeness: plano-concave
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
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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).

Online Etymology Dictionary, © 2010 Douglas Harper
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plano- in Medicine

plano- or plani- or plan-
pref.
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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