Specifically a toilet for defecation, as opposed to 小便所 (urinal). Often used in contexts where the distinction matters, such as in older facilities or historical descriptions.
See also: 小便所
In this park's public restroom, the toilets for defecation and the urinals are separate.
Compound of 大便 (defecation, feces) and 所 (place). The term is straightforward and transparent, but it is not commonly used in everyday conversation; more general terms like トイレ or 便所 are preferred.