Mural: of or pertaining to a wall; e.g., a mural decoration. See Secco, Fresco.
Mutule: one of a series of rectangular blocks under the Cornice of a Doric Entablature, studded on the underside with Guttæ (which see).
[N]aos: the principal chamber of an Hellenic temple, containing the statue of the deity. Entered from the front through an unwalled vestibule, called the Pronaos and from the rear by a corresponding vestibule, called Epinaos or Opisthodomos.
Narthex: the arcaded porch of a Christian basilica, where penitents, barred from full communion, worshipped. See Galilee.
Nave (from Naos, which see): central division of a church or cathedral; usually west of the choir.
Necking: the hollowed surface between the Astragal (which see) of the shaft and the commencement of the capital; specifically of a Roman Doric column.
Necropolis: city of the dead: an assemblage of graves or tombs.
Newel Post: the shaft around which a spiral staircase is constructed; also the principal post supporting the handrail of a staircase.
Norman: the style in England, preceding Early English: corresponding to Romanesque on the Continent.
Nymphæum (consecrated to the nymphs): a building containing ornamental water, plants and statuary.