lavatory — a toilet, especially one in a public place or on an aircraft/train

a passenger approaches the small airplane lavatory door while holding their stomach with an urgent expression. They reach for the door handle as other passengers wait in the narrow aisle behind them. The compact lavatory space is visible through the partially open door showing the tiny sink and toilet inside. A flight attendant points toward the lavatory to help guide another passenger who looks confused. Other travelers shift in their seats as people move through the tight aisle space. a toilet facility in a public transportation setting