Webster’s Revised Unabridged Dictionary · 1913
Lancer
Lan′cer (lȧn′sẽr), 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.]