Definitions for bywayˈbaɪˌweɪ
Random House Webster's College Dictionary
a secluded, obscure, or little-used road.
a subsidiary or obscure field of research, endeavor, etc.
Origin of byway:
byway, bypath, byroad(noun)
a side road little traveled (as in the countryside)
a road that is not frequently travelled
an unpopular or arcane field of study
a secluded, private, or obscure way; a path or road aside from the main one