Webster's Revised Unabridged Dictionary · 1913

Lancer

Lancer , noun

[Compare French 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. [Obsolete]
3.
(Dancing) A set of quadrilles of a certain arrangement.