central corridor; middle hallway
Refers to a corridor that runs through the center of a building, often connecting rooms on both sides. Common in descriptions of traditional Japanese houses or school layouts.
This house connects the north and south rooms with a central corridor.
Compound of 中 (naka, 'middle') and 廊下 (rōka, 'corridor'). The reading なかろうか is a straightforward combination of the kun'yomi of 中 and the on'yomi of 廊下.