Etymology
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logo (n.)
"simple symbol or graphic meant to represent something," 1937, probably a shortening of logogram "sign or character representing a word."
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logorrhea (n.)
1878, from logo- "word, speech" + ending from diarrhea.
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logolatry (n.)
"worship of words," 1810 (Coleridge), from logo- + -latry "worship of."
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logocentric (adj.)
"centered on reason," 1931, from logo- "reason" + -centric.
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logomaniac (n.)

"one mad for words," 1870; see logo- "word" + maniac (see mania).

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logophobia (n.)
"fear of words," 1890; see logo- "word" + -phobia "fear." Related: Logophobe; logophobic.
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logo- 
before vowels log-, word-forming element meaning "speech, word," also "reason," from Greek logos "word, discourse; reason," from PIE root *leg- (1) "to collect, gather," with derivatives meaning "to speak (to 'pick out words')."
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logogram (n.)
"word-sign, sign or character representing a word," 1840, from logo- "word" + -gram. Generically, "any symbol representing graphically a product, idea, etc.," from 1966. The earliest use of the word (1820) is in the sense "logograph," but OED explains this as a substitute for logograph, "which in this sense is itself a mistake for logogriph," the old type of word-puzzle.
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logomachy (n.)
"contention about, or with, words," 1560s, a nativized Latinized form of New Testament Greek logomakhia "a war about words," from logomakhos (see logo- + -machy). Related: Logomach; logomachical.
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logograph (n.)
"instrument for giving a graphic representation of speech, word-writer," 1879, from logo- "word" + -graph "instrument for recording; something written." Earliest use (1797) is in the sense "logogriph," and it frequently was used in place of that word (see logogriph). In ancient Greek, logographos was "prose-writer, chronicler, speech-writer." Related: Logographic.
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