a person who tunes musical instruments: a piano tuner
the part of a radio or TV receiver that detects signals; esp., a separate unit of a high-fidelity system
See tuner in American Heritage Dictionary 4
(to͞oˈnər, tyo͞oˈ-)
noun
One that tunes: a piano tuner.
A device for tuning, especially an electronic circuit or device used to select signals at a specific radio frequency for amplification and conversion to sound.