A by-passage, for a pipe, or other channel, to divert circulation from the usual course.

A passage for a fluid, permitting a portion of the fluid to flow around its normal pass flow channel. - Carbon element, the principal combustible constituent of all fuels.

a pipe, flume, open channel or other means of conveyance that transports fish back to the body of water from which the fish were diverted, but does not include fishways or other passages around a dam

a new road which typically skirted a town in order to avoid mid-town traffic congestion; sometimes refers to a housing sub-division or shopping area which develops along the new route; by-passes are often built through rural land contiguous to the town or city, but quickly lose their rural character as development occurs along the by-pass: Sewanee by-pass; Huntland by-pass.

A road built around a busy urban area to avoid traffic jams.

Road passing around a city to provide a faster alternative route for traffic.