
In architecture, a small porch built on both north and south sides of some English pre-Conquest churches, and thus forming rudimentary transepts. ...
Found on
http://www.encyclo.co.uk/local/20688

A side chapel or chapels. In the early Anglo-Saxon church it was not permitted for burials to be made in the body of the church, but they were allowed in the flanking chapels or porticus.
Found on
https://www.encyclo.co.uk/local/20434

(Latin; pl. porticus: porch). An open structure with a roof supported by columns. In a Roman theatre the covered colonnade at back of cavea or behind scene house. Behind the scenes porticus are to be built; to which, in the case of sudden showers, the people may retreat from the theatre.
Found on
https://www.whitman.edu/theatre/theatretour/glossary/glossary.htm
No exact match found.