D defs.my
Entry 1 sense Webster, 1913

Crossbar

/(-bär`)/ · Cross·bar · IPA /ˈkɹ̠ɑs.bɑɹ/
01 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 tu…
  1. 1.
    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.
Phrases & compounds
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.