Portico
a covered walk, supported by columns, and usually vaulted; a piazza or arched walk; a porch before the entrance of a building fronted with columns. Porticoes are known as tetrastyle, hexastyle, octostyle, or decastyle, according as they have four, six, eight, or 10 columns in front. A prostyle por- PORTLAND tico is one projecting in front of the building; a portico in antis is one receding within the building.