the.com/rowhouse

means One of a continuous row of houses sharing side walls with its neighbors, each with its own entrance but no gap between them.

from Straightforward compound of 'row' (a line of things) plus 'house' — tracing back to English terraced housing built by developers in the 1700s-1800s who found it cheaper and more efficient to build homes wall-to-wall in a line rather than as freestanding structures. The style crossed to American cities like Baltimore, Philadelphia, and Brooklyn, where 'rowhouse' became the common term, while the British kept calling the same thing a 'terrace' or 'terraced house.'