Englishfor English speakers
semiconductor
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noun
a substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; its conductivity increases with temperature and in the presence of impurities
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noun
(= semiconductor device)
a conductor made with semiconducting material
amplifier
Noun
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An amplifier is an electronic device that increases the strength of a sound or signal.
You need to plug in the amplifier to get any sound.