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出典:Wiktionary
From sessor + -ium, i.e. "something of the sitter", or equivalently, from sedeo (“to sit, be seated”) + -tōrium (suffix forming nouns denoting places),
sessōrium n (genitive sessōriī または sessōrī); second declension
Second-declension noun (neuter).
1Found in older Latin (until the Augustan Age).
sessorium