tuning-fork

n small steel device like a two-pronged fork that produces a note of fixed pitch (usu middle C) when struck 音叉.

tumultuous, tumulus, tun, tuna, tundra, tune, tune in, tune in (to), tune out, tune up, tune-up, tuneful, tunefully, tunefulness, tuneless, tunelessly, tunelessness, tuner, tungsten, tunic, tunnel, tunnel vision, tunny, tup, tuppence, tuppenny, turban, turbaned, turbid, turbidity, turbine, turbo-jet, turbo-prop, turbot, turbulence, turbulent, turbulently, turd, tureen, turf,