Groin.—The curved line which is made by the meeting of the surfaces of two vaults or portions of vaults which intersect.
Group.—An assemblage of shafts or mouldings or other small features intended to produce a combined effect.
Grouping.—Combining architectural features as above.
Hall.—(1) The largest room in an ancient English mansion, or a college, &c.; (2) any large and stately apartment.
Half Timbered Construction.—A mode of building in which a framework of timbers is displayed and the spaces between them are filled in with plaster or tiles.
Hammer Beam Roof.—A roof peculiar to English architecture of the fifteenth century, deriving its name from the use of a hammer beam (a large bracket projecting from the walls) to partly support the rafters.
Head (of an arch or other opening).—The portion within the curve; whether filled in by masonry or left open, sometimes called a tympanum.
Hip.—The external angle formed by the meeting of two sloping sides of a roof where there is no gable.
Hôtel (French).—A town mansion.
Impost.—A moulding or other line marking the top of the jambs of an arched opening, and the starting point, or apparent starting point, of the arch.