by·pass also by-pass 
(bīpăs′)
(bīpăs′)n.
1. A highway or section of a highway that passes around an obstructed or congested area.
2. A pipe or channel used to conduct gas or liquid around another pipe or a fixture.
3. A means of circumvention.
4. Electricity See shunt.
5. Medicine
a. An alternative passage created surgically to divert the flow of blood or other bodily fluid or circumvent an obstructed or diseased organ.
b. A surgical procedure to create such a channel: a coronary artery bypass; a gastric bypass.
tr.v. by·passed, by·pass·ing, by·pass·es also by-passed or by-pass·ing or by-pass·es
1. To avoid (an obstacle) by using an alternative channel, passage, or route.
2. To be heedless of; ignore: bypassed standard office procedures.
3. To channel (piped liquid, for example) through a bypass.