Wordnet 3.0
NOUN (3)
1.
a horizontal bar that goes across something;
2.
game equipment consisting of a horizontal bar to be jumped or vaulted over;
3.
long thin horizontal crosspiece between two vertical posts;
The Collaborative International Dictionary of English v.0.48:
Crossbar \Cross"bar`\ (-b[aum]r`), n.
A transverse bar or piece, as a bar across a door, or as the
iron bar or stock which passes through the shank of an anchor
to insure its turning fluke down. --Russell.
[1913 Webster]
Crossbar shot, a projectile which folds into a sphere for
loading, but on leaving the gun expands to a cross with a
quarter ball at the end of each arm; -- used in naval
actions for cutting the enemy's rigging.
[1913 Webster]
WordNet (r) 3.0 (2006):
crossbar
n 1: a horizontal bar that goes across something
2: game equipment consisting of a horizontal bar to be jumped or
vaulted over
3: long thin horizontal crosspiece between two vertical posts