noun
door between rooms; interior sliding door
Refers to a door, often a sliding door (fusuma or shoji), that separates two rooms in a traditional Japanese house. Not used for exterior doors.
間の戸を開けて隣の部屋へ行った。
I opened the door between the rooms and went into the next room.
この家の間の戸はすべてふすまだ。
All the interior doors in this house are fusuma.
Compound of 間 (あい, 'space between') + の (possessive particle) + 戸 (と, 'door'). Literally 'door of the space between'.