pipe organ
US /ˈpaɪp ˌɔːr.ɡən/
UK /ˈpaɪp ˌɔːr.ɡən/
1.
a large musical instrument consisting of a number of pipes of various lengths and materials that produce sounds by means of compressed air, played using one or more keyboards and a pedalboard.
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The grand pipe organ filled the cathedral with majestic sound.
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She practiced for hours on the church's pipe organ.