Emily Dickinson Lexicon

COURS'ER, n.

1. A swift horse; a runner; a war horse; a word used chiefly in poetry. – Dryden. Pope.
2. One who hunts; one who pursues the sport of coursing hares. – Johnson.
3. A disputant. [Not in use.] – Wood.
4. An order of fowls which have short wings, and move chiefly by running, as the ostrich, dodo, and cassowary. – Kirby.