Synonym of reredorter: a monastery's latrine, outhouse, or lavatory, typically located behind the dormitory.
The other outlet from the pisalis […] leads to the necessarium, in the corner of which a light […] is kept burning.
A lavatory.
From Latin necessarium (“reredorter; outhouse”), from necesse (“unavoidable or necessary [thing]”) + -ārium (“-arium, -ium: forming locations”).
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Viewers […] don't mind having a hundred variations, from ‘The Necessarium’ to ‘The Thunder-Box’ to choose from.
Alternative form of necessarium.