sidelight

A light coming from the side.

Either of two lights, red to port, green to starboard, shown by ships at night.

A piece of incidental or contrasting information.

An additional activity; a sideline.

A light found at the side of something; especially of a vehicle.

A window found at one or both sides of a door.

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