Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A light coming from the side.
  • noun Nautical Either of two lights, red to port, green to starboard, shown by ships at night.
  • noun A piece of incidental or contrasting information.
  • noun Usage Problem An additional activity; a sideline.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A light found at the side of something; especially of a vehicle.
  • noun A window found at one or both sides of a door.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun light carried by a boat that indicates the boat's direction; vessels at night carry a red light on the port bow and a green light on the starboard bow

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