clav·i·chord /ˈklævəˌkɔrd/
  翼琴[鋼琴的前身]
  Clav·i·chord n.  Mus. A keyed stringed instrument, now superseded by the pianoforte. See Clarichord.
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  clavichord
       n : an early stringed instrument like a piano but with more
           delicate sound