roof-tree

n strong horizontal main beam at the highest point of a roof 脊檩; 大梁; 正梁.

Romano-, romantic, romantically, romanticism, romanticist, romanticize, romanticize, romanticise, Romany, Rome, romp, rompers, Ronald Reagan, rondo, rontgen, rood, rood-screen, roof, roof-garden, roof-rack (also `luggage-rack), roof-top, roofing, rook, rookery, rookie, room, room service, room-mate, roomer, roomful, roominess, rooming-house, roomy, roost, rooster, root, root beer, root vegetable, root-crop, rooted, rootless,