1. speed of light the speed at which light travels in a vacuum
  2. spotlight a lamp that produces a strong beam of light to illuminate a restricted area; used to focus attention of a stage performer
  3. spaceflight a voyage outside the Earth's atmosphere
  4. City of Light the capital and largest city of France
  5. beam of light a column of light (as from a beacon)
  6. shaft of light a column of light (as from a beacon)
  7. see the light change for the better
  8. speed limit regulation establishing the top speed permitted on a given road
  9. spiteful showing malicious ill will and a desire to hurt
  10. spadefoot a burrowing toad of the northern hemisphere with a horny spade-like projection on each hind foot
  11. spadeful the quantity a shovel can hold
  12. spathe flower any of various plants of the genus Spathiphyllum having a white or green spathe and a spike of fragrant flowers and often cultivated as an ornamental
  13. redeye flight a night flight from which the passengers emerge with eyes red from lack of sleep
  14. spitefully in a maliciously spiteful manner
  15. paddy field an irrigated or flooded field where rice is grown
  16. salt flat a flat expanse of salt left by the evaporation of a body of salt water
  17. stoplight a visual signal to control the flow of traffic at intersections
  18. beet blight a disease of beet plants
  19. spur blight a disease of raspberries
  20. sidelight light carried by a boat that indicates the boat's direction