Etymology
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microphone (n.)

1680s, "ear trumpet for the hard-of-hearing," coined from Greek mikros "small" (see micro-) + phōnē "sound," from PIE root *bha- (2) "to speak, tell, say." The notion is "instrument for augmenting small sounds." Modern sense of "transducer that converts sound into an electrical signal" is by 1924 in radio broadcasting and movie recording, from the earlier sense "amplifying telephone transmitter" (1878). Of the two spellings of the short form of the word, mike (1924) is older than mic (1961). Related: Microphonic; microphony.

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capacitor (n.)
"device which stores electricity," 1926, from capacity, in reference to electrical conductors, with Latinate agent-noun ending.
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mic (n.)

shortened form of microphone, attested by 1961.

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bug (v.4)
"equip with a concealed microphone," 1949, earlier "equip with an alarm system," 1919, underworld slang, probably a reference to bug (n.1). Bug (n.) "concealed microphone" is from 1946. Related: Bugged; bugging.
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debug (v.)

"remove the faults from," 1945, of machine systems, from de- + bug (n.) "glitch, defect in a machine." Meaning "to remove a concealed microphone" is from 1964. Related: Debugged; debugging.

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boom (n.1)
"long pole," 1640s, specifically, "long spar run out from a ship" (1660s), from Scottish boun, borrowed from Dutch boom "tree, pole, beam," from a Middle Dutch word analogous to German Baum, English beam (n.). As "movable bar for a microphone or camera," 1931.
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*bha- (2)

*bhā-; Proto-Indo-European root meaning "to speak, tell, say."

It forms all or part of: abandon; affable; anthem; antiphon; aphasia; aphonia; aphonic; apophasis; apophatic; ban (n.1) "proclamation or edict;" ban (v.); banal; bandit; banish; banlieue; banns (n.); bifarious; blame; blaspheme; blasphemy; boon (n.); cacophony; confess; contraband; defame; dysphemism; euphemism; euphony; fable; fabulous; fado; fairy; fame; famous; fandango; fatal; fate; fateful; fatuous; fay; gramophone; heterophemy; homophone; ineffable; infamous; infamy; infant; infantile; infantry; mauvais; megaphone; microphone; monophonic; nefandous; nefarious; phatic; -phone; phone (n.2) "elementary sound of a spoken language;" phoneme; phonetic; phonic; phonics; phono-; pheme; -phemia; Polyphemus; polyphony; preface; profess; profession; professional; professor; prophecy; prophet; prophetic; quadraphonic; symphony; telephone; xylophone.

It is the hypothetical source of/evidence for its existence is provided by: Greek pheme "speech, voice, utterance, a speaking, talk," phōnē "voice, sound," phanai "to speak;" Sanskrit bhanati "speaks;" Latin fari "to say," fabula "narrative, account, tale, story," fama "talk, rumor, report; reputation, public opinion; renown, reputation;" Armenian ban, bay "word, term;" Old Church Slavonic bajati "to talk, tell;" Old English boian "to boast," ben "prayer, request;" Old Irish bann "law."

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