A subsidiary or subordinate town / A town that has its own name and postal code, but which is governed by another town

plural of bytown

(mineralogy) A plagioclase feldspar, the fifth member of the Albite-Anorthite solid solution series. Bytownite is rare, and normally occurs in small grains in lime-rich igneous rocks. Clear pale yellow crystals have come from Mexico and Oregon.

plural of bytownite