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bullhorn an electronic, usu. portable megaphone or loudspeaker that can amplify the voice or other sounds.
megaphone a hand-held, funnel-shaped device used to amplify and direct the sound of a voice.
repeater in communications, an antenna that can receive, amplify, and transmit the same signal. [1/3 definitions]
stethoscope an instrument used to amplify sounds made by internal organs such as the heart, and convey them to an examiner's ear.