\Lan"cer\, n. [Cf. F. lancier.]
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.
   --Wilhelm.
2. A lancet. [Obs.]
3. pl. (Dancing) A set of quadrilles of a certain
   arrangement. [Written also {lanciers}.]