D defs.my
Entry 1 sense Webster, 1913

Bridgehead

/brĭj'-hĕdˌ/ · Bridge·head · IPA /ˈbɹɪd͡ʒhɛd/
01 n. A fortification commanding the extremity of a bridge nearest the enemy, to insure the preservation and usefulness of the bridge, and preven…
  1. 1.
    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.