Etymology
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grandiloquence (n.)
"lofty speaking or expression," 1580s, from Latin grandiloquentia, from grandiloquus "using lofty speech, bombastic," from grandis "big" (see grand (adj.)) + -loquus "speaking," from loqui "to speak" (from PIE root *tolkw- "to speak").
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grandiloquent (adj.)
1590s, probably a back-formation from grandiloquence. Related: Grandiloquently.
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megaphone (n.)

"funnel-like instrument for assisting hearing or magnifying the voice," 1878, coined (perhaps by Thomas Edison, who invented it) from Greek megas "great" (see mega-) + phone "voice" (from PIE root *bha- (2) "to speak, tell, say"). Related: Megaphonic. In Greek, megalophonia meant "grandiloquence," megalophonos "loud-voiced."

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