Mark"er (?), n.
One who or that which marks
. Specifically: (a)
One who keeps account of a game played, as of billiards.
(b)
A counter used in card playing and other games.
(c)
Mil. The soldier who forms the pilot of a wheeling column, or marks the direction of an alignment.
(d)
An attachment to a sewing machine for marking a line on the fabric by creasing it.
© Webster 1913.