OS MtCur6:6 :ܐܡܬܝ ܕܡܨܠܐ ܐܢܬ܂ ܥܘܠ ܠܟ ܠܬܘܢܐ܂ ܘܐܚܘܕ ܬܪܥܐ ܒܐܦ̈ܝܟ‏ : when you pray, go inside a room and shut the door behind you
See the entire entry for tawwān, tawwānā n.m. chamber