NounBridgehead (plural Bridgeheads)
- An area around the end of a bridge.
- (military) A fortification around the end of a bridge.
- (military) An area of ground on the enemy's side of a bridge, especially one that needs to be taken and defended in order to secure an advance.
- (chemistry) Either of the two atoms in different parts of a molecule that are connected by a bridge.
acropolis, advance guard, airhead, avant-garde, bastion, battle line, beachhead, blockhouse, bunker, castle, citadel, donjon, farthest outpost, fasthold, fastness, first line, forefront, fort, fortress, front, front line, front rank, front-runner, garrison, garrison house, hold, keep, line, martello, martello tower, mote, motte, outguard, outpost, peel, peel tower, pillbox, pioneer, point, post, precursor, railhead, rath, safehold, scout, spearhead, strong point, stronghold, tower, tower of strength, van, vanguard, ward