lanc·er /ˈlæn(t)sɚ/
  使用槍的騎兵,一種四人組的舞
  Lan·cer n.
  1. One who lances; one who carries a lance; especially, a member of a mounted body of men armed with lances, attached to the cavalry service of some nations.
  2. A lancet. [Obs.]
  3. pl. Dancing A set of quadrilles of a certain arrangement. [Written also lanciers.]
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  lancer
       n : (formerly) a cavalryman armed with a lance