Definition of "side-bar" []

• In carriages: (noun)
• A longitudinal side-piece, especially in a military traveling forge or a battery-wagon. (noun)
• One of two elastic wooden bars placed one on each side of the body of some forms of light wagon or buggy to connect it with the gearing and to serve both as a support and as a spring. (noun)
• In saddlery, one of two plates which unite the pommel and cantle of a saddle. (noun)
• In the Scottish Court of Session, the name given to the bar in the outer parliament-house, at which the lords ordinary formerly called their hand-rolls. (noun)

The Century Dictionary (Public Domain)

• "Life at HOK is a blog to which numerous HOK people contribute – judging from the side-bar, 30 people have submitted around 540 posts to date."
• "It's tucked away in the Chronicles of Elantra side-bar, under the Cast in Silence entry."
• "Several clients allow you to make groups or lists and have them displayed either simultaneously in side-by-side columns (Tweetdeck and Seesmic Desktop) or with the ability to switch the group being viewed by clicking on a list in a side-bar (Friendfeed)."