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Webster 1913 Edition

Noun.

A utensil to hold a chamber vessel, for the use of the sick and infirm. It is usually in the form of a box, with a seat and tight cover.

Noun.

A chamber utensil for the convenience of the sick and infirm.

See also: closestool and close stool

close-stool ‎(plural close-stools)

(historical) A chamber pot enclosed in a stool or box; a commode.
- 1603, John Florio, translating Michel de Montaigne, Essayes, London: Edward Blount, OCLC 946730821, Folio Society. 2006, p.17:
  other Princes, […] to dispatch their weightiest affaires make often their close stoole, their regall Throne or Councel-chamber
- 2003, Mercedes Lackey/James Mallory, The Outstretched Shadow
  "No more midnight treks to the outhouse. No more close-stools or thundermugs a feature of even the most exalted houses in Armethalieh."