a combining form appearing in loanwords from Greek, where it meant “word,” “speech” (logography ); on this model, used in the formation of new compound words (logotype ).
Also, especially before a vowel, log-.
Compare -logic, -logue, -logy.

< Greek logo-, combining form of lógos logos

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World English Dictionary
combining form
indicating word or speech: logogram
[from Greek; see logos]

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

logo- or log-
word; speech: logoplegia.

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