bridgehead

• POS: Noun
• HYPHEN: bridge=head

CIDE DICTIONARY

bridgehead, n. 

 A fortification commanding the extremity of a bridge nearest the enemy, to insure the preservation and usefulness of the bridge, and prevent the enemy from crossing; a tête-de-pont.  [1913 Webster]

OXFORD DICTIONARY

bridgehead, n. Mil. a fortified position held on the enemy's side of a river or other obstacle.

THESAURUS

bridgehead

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