1. motor scooter a wheeled vehicle with small wheels and a low-powered gasoline engine geared to the rear wheel
  2. PET scanner a tomograph that produces cross-sectional X-rays of metabolic processes in the body
  3. CAT scanner a tomograph that constructs a 3-D model of an object by combining parallel planes
  4. water scooter a motorboat resembling a motor scooter
  5. mule skinner a worker who drives mules
  6. mattress cover bedclothes that provide a cover for a mattress
  7. water skater long-legged bug that skims about on the surface of water
  8. Peter Seeger United States folk singer who was largely responsible for the interest in folk music in the 1960s (born in 1919)
  9. Fred Skinner United States psychologist and a leading proponent of behaviorism (1904-1990)
  10. Otis Skinner United States actor (1858-1942)
  11. image scanner an electronic device that generates a digital representation of an image for data input to a computer
  12. Etruscan a native or inhabitant of ancient Etruria
  13. water softener a substance (such as sodium chloride) that lessens the hardness of water by replacing calcium and magnesium ions with sodium ions and so gives the water more efficient sudsing power
  14. Metaurus River a battle during the second Punic War
  15. digital scanner an electronic device that generates a digital representation of an image for data input to a computer
  16. mother superior the superior of a group of nuns
  17. meteor shower a transient shower of meteors when a meteor swarm enters the earth's atmosphere
  18. prairie schooner a large wagon with broad wheels and an arched canvas top
  19. water skin a container of skin for holding water
  20. Mother Seton United States religious leader who was the first person born in the United States to be canonized (1774-1821)