ket·tle·drum /-ˌdrʌm/
  銅鼓,定音鼓;午後茶會
  Ket·tle·drum n.
  1. Mus. A drum made of thin copper in the form of a hemispherical kettle, with parchment stretched over the mouth of it.
  Note: ☞ Kettledrums, in pairs, were formerly used in martial music for cavalry, but are now chiefly confined to orchestras, where they are called tympani.
  2. An informal social party at which a light collation is offered, held in the afternoon or early evening.  Cf. Drum, n., 4 and 5.
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  kettledrum
       n : a large hemispherical brass or copper percussion instrument
           with a drumhead that can be tuned by adjusting the
           tension on it [syn: kettle, tympanum, tympani, timpani]