noun
double sliding door
A door consisting of two panels that slide past each other in a track, commonly used in Japanese architecture.
和室には引違い戸がよく使われている。
Double sliding doors are often used in Japanese-style rooms.
引き戸 is a general term for a sliding door, while 引違い戸 specifically refers to a double sliding door where two panels slide past each other.
Compound of 引き (hiki, 'pulling') + 違い (chigai, 'difference' or 'crossing') + 戸 (to, 'door'), referring to doors that slide past each other.