marker

One that marks or serves as a mark, as:

1. A bookmark.

2. A tombstone.

3. A milestone.

4. A device, such as a line, stake, or flag, set on a playing field and showing the playing or scoring position.

5. A player who guards an opponent, as in soccer.

6. An official in certain court games, such as squash, who mainly judges whether the ball is out of play and whether a fault or let has occurred.

7. One that keeps score in various games.

8. A score in a game.

An implement, especially a felt-tipped pen, used for marking or writing.

One who marks objects, especially for industrial purposes.

One who grades student papers.

Sports

1. A device, such as a line, stake, or flag, set on a playing field and showing the playing or scoring position.

2. A player who guards an opponent, as in soccer.

3. An official in certain court games, such as squash, who mainly judges whether the ball is out of play and whether a fault or let has occurred.

4. One that keeps score in various games.

5. A score in a game.

Games

1. One that keeps score in various games.

2. A score in a game.

Slang A written, signed promissory note.

A genetic marker.

Medicine A physiological substance, such as human chorionic gonadotropin or alpha-fetoprotein, that when present in abnormal amounts in the serum may indicate the presence of disease, as that caused by a malignancy. Also called biomarker.

Linguistics An element that indicates grammatical class or function; a derivational or inflectional morpheme.