What is another word for "moat"?

Roget's Thesaurus (1911) lists these synonyms for "moat": balustrade, barricade, barrier, bent, bisulcate, bisulcous, bite, canaliculated, case, chamfer, channel, circumscribe, circumvallation, cordon, corduroy, corral, costate, crack, cradle, defense, dike, dingle, ditch, door, dyke, enceinte, engrave, envelope, espalier, etch, fence, flute, fluted, fluting, fold, fosse, furrow, gate, gateway, girdle.