Pronunciation: (sīd'līt"), [key]
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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.