portiere (n.)

curtain hung at the doorway or entrance to a room," 1843, from French portière, which is formed in French from porte "door," or from Medieval Latin portaria, fem. singular of Latin portarius "belonging to a door or gate," from porta "city gate, gate; door, entrance," from PIE root *per- (2) "to lead, pass over."

A curtain hung at a doorway, or entrance to a room, either with the door or to replace it, to intercept the view or currents of air, etc., when the door is opened, or for mere decoration. [Century Dictionary]