From WordNet (r) 2.0 (August 2003) [wn]:
backgammon
n : a board game for two players; pieces move according to
throws of the dice
From The Collaborative International Dictionary of English v.0.48 [gcide]:
backgammon \back"gam`mon\, n. [Origin unknown; perhaps fr. Dan.
bakke tray + E. game; or very likely the first part is from
E. back, adv., and the game is so called because the men are
often set back.]
A game of chance and skill, played by two persons on a
"board" marked off into twenty-four spaces called "points".
Each player has fifteen pieces, or "men", the movements of
which from point to point are determined by throwing dice.
Formerly called tables.
[1913 Webster]
backgammon board, a board for playing backgammon, often
made in the form of two rectangular trays hinged together,
each tray containing two "tables".
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
backgammon \back`gam"mon\, v. t.
In the game of backgammon, to beat by ending the game before
the loser is clear of his first "table". When played for
betting purposes, the winner in such a case scores three
times the wagered amount.
[1913 Webster +PJC]
From The Free On-line Dictionary of Computing (19 Sep 2003) [foldoc]:
backgammon
See bignum, moby, pseudoprime.
[Jargon File]
From Jargon File (4.4.4, 14 Aug 2003) [jargon]:
backgammon
See bignum (sense 3), moby (sense 4), and pseudoprime.