sliding door
From Longman Dictionary of Contemporary EnglishRelated topics: Buildings, Householdsliding doorˌsliding ˈdoor noun [countable] TBBDHa door that opens by sliding to one sideExamples from the Corpussliding door• I carried the telephone into our little foyer and closed the sliding door.• He walked me to the sliding door, open just wide enough for a person to slip through.