a combining form meaning “place,” “local,” used in the formation of compound words: topography; topology.
Also, especially before a vowel, top-.

combining form of Greek tópos place, commonplace Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
topo (ˈtɒpəʊ)
n , pl topos
mountaineering a picture of a mountain with details of climbing routes superimposed on it
[C20: shortened from topographical picture]

topo- or (before a vowel) top-
combining form
indicating place or region: topography; topology; toponym; topotype
[from Greek topos a place, commonplace]
top- or (before a vowel) top-
combining form
[from Greek topos a place, commonplace]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

topo- or top-
Place; area: topoanesthesia.

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