An instrument, such as an ear trumpet, which amplifies weak sounds.

A mechanical device (such as an ear trumpet) by which faint sounds can be made more audible. Obsolete.

(a) n. an instrument that amplifies a sound; (b) adj. designating such an instrument.

A structure or device which reinforces or amplifies sounds by resonance; esp. part of a musical instrument serving this purpose.

= resonator, n. 1; cf. resonant cavity n. at resonant, adj. n.compounds.

= resonator, n. 1.

A device for transmitting speech over a distance; spec. one conceived by Edison for amplifying speech sounds for outdoor purposes. Now historical.

A device to aid hearing, consisting of two funnel-shaped receivers (‘listening funnels’) which collect sound waves and are connected to the ear by…

an instrument by which pulsations are rendered audible.

A type of stethoscope having a chest piece consisting of a flattened circular chamber closed by a diaphragm (originally two movable discs)…

A pneumatic recorder for a phonograph; also, a phonograph fitted with this recorder; an amplifying instrument. (Disused.)

An electrical device for reproducing sounds, esp. the human voice, with increased intensity.