ホスチアalso: ホスティア · オスチヤホスチアMeanings1nounhost; holy wafer; consecrated breadChristian term referring to the consecrated bread used in the Eucharist; a loanword from Latin 'hostia'.from Latin hostiaミサで司し祭さいがホスチアを信しん者じゃに配くばった。