marker - Dictionary definition and pronunciation - Yahoo! Education
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mark·er  audio  (märkr) KEY 

NOUN:
  1. One that marks or serves as a mark, as:
    1. A bookmark.
    2. A tombstone.
    3. A milestone.
  2. An implement, especially a felt-tipped pen, used for marking or writing.
  3. One who marks objects, especially for industrial purposes.
  4. One who grades student papers.
  5. 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.
  6. Games
    1. One that keeps score in various games.
    2. A score in a game.
  7. Slang A written, signed promissory note.
  8. A genetic marker.
  9. 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.
  10. Linguistics An element that indicates grammatical class or function; a derivational or inflectional morpheme.



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