1. Entrance-porch of a church.
2. Apse of a church.
3. Structure over a medieval tomb (also called porticulus).
4. Long covered ambulatory with a roof carried on colonnades, sometimes attached to a building, and sometimes a separate structure.
5. Room or side-chapel projecting from the nave of a church entered through arches in the walls of the nave, as seems to have been the case at the Anglo-Saxon church at Brixworth, Northants., where there appear to have been a series of porticus to the north and south of the nave.
6. Arched arbour (sometimes called portique) or garden-walk under a pergola.
7. As portico.
Oxford English Dictionary (1933);
OED Supplement (1984);
"porticus." A Dictionary of Architecture and Landscape Architecture. . Encyclopedia.com. (August 17, 2018). http://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/porticus
"porticus." A Dictionary of Architecture and Landscape Architecture. . Retrieved August 17, 2018 from Encyclopedia.com: http://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/porticus