the.com/latrine

means A communal toilet, typically a makeshift or basic one dug or installed for use by many people at once, as in a camp, barracks, or public facility.

from From French latrine, which came from Latin latrina — itself a worn-down contraction of lavatrina, 'a place for washing,' from lavare, 'to wash' (the same root gives us lavatory and lave). The word basically shrank through centuries of fast talking, the middle syllables eroding away like a path worn through grass, until 'a washing place' hardened into the blunter, more specific sense of 'the pit toilet.'