noun
tuning fork
A two-pronged metal instrument that produces a fixed pitch when struck, used for tuning musical instruments or in scientific demonstrations.
ピアノの調律師は音叉を使って基準の音を取る。
A piano tuner uses a tuning fork to get the reference pitch.
理科の実験で音叉をたたいて音の伝わり方
In science class, we struck a tuning fork to investigate how sound travels.
Compound of 音 (on, 'sound') and 叉 (sa, 'fork'), describing the instrument's shape and function. The reading is on'yomi.