Pronunciation: (sīd'līt"),[key] —n. 1. an item of incidental information.
2. either of two lights carried by a vessel under way at night, a red one on the port side and a green on the starboard.
3. light coming from the side.
4. a window or other aperture for light in the side of a building, ship, etc.
5. a window at the side of a door or another window.