From Longman Dictionary of Contemporary Englishtunertun‧er /ˈtjuːnə $ ˈtuːnər/ noun [countable] 1 TCBthe part of a radio or television that you can change to receive different TV or radio stations2 a person who tunes pianos3 an electronic machine that helps you to tune a musical instrument such as a guitar
Examples from the Corpus
tuner• Gregory's bass guitar was out of tune because of a wayward string and none of the group had guitar tuners.• The banjo-style tuners are the coolest things too.• She could feel their tension and their eyes on her as she flicked the tuner across the dial desperately.• I was fiddling with the tuner, trying to get a station with news.• The tuners are Jackson's own and feel satisfyingly smooth and efficient, with no unwanted backlash.• These sockets are followed by a useful tuner output which feeds any external guitar tuner without interrupting the signal path. 