moatnounmasculine/'fo.su/mediumfos·soPortuguesEnglishEspanolFrancaisDefinitionA deep, wide ditch surrounding a castle, fort, or town, typically filled with water and used as a defence.The castle was protected by a water-filled moat.Archaeologists discovered an ancient moat.synditchtrenchCommon collocationscastle moatdefensive moatcross the moatdry moatEtymologyDo latim 'fossus', particípio passado de 'fodere' (cavar).Related wordsfossafossadoafossar