por·ti·co 
(pôrtĭ-kō′)
(pôrtĭ-kō′)n. pl. por·ti·coes or por·ti·cos
A porch or walkway with a roof supported by columns, often leading to the entrance of a building.
[Italian, from Latin porticus, from porta, gate; see per-2 in the Appendix of Indo-European roots.]
porti·coed′ adj.