Meanings

opening a door

door

fire door

door(s) of a gate

watertight door

frontispiece

iron door

back leaf

automatic door

revolving door

opening a door for a moment (esp. on the train, when someone's foot is stuck, etc.)

twenty questions (game)

double doors (opening from the centre)

trapdoor

doorway

glass door

chapter title page

closure of a gate or door

internal door

front door (of a cabinet, bus, etc.)