1. call number a mark consisting of characters written on a book
  2. real number any rational or irrational number
  3. whole number any of the natural numbers or zero
  4. clumber a thickset spaniel with longish silky hair
  5. calender a machine that smooths or glazes paper or cloth by pressing it between plates or passing it through rollers
  6. calendar a system of timekeeping that defines divisions of the year
  7. clinometer an instrument used by surveyors in order to measure an angle of inclination or elevation
  8. clan member a member of a clan
  9. Callionymidae dragonets
  10. mass number the sum of the number of neutrons and protons in an atomic nucleus
  11. gallantry the qualities of a hero or heroine
  12. magic number the atomic number of an extra stable strongly bound atomic nucleus: 2, 8, 20, 28, 50, 82 or 126
  13. lawn mower garden tool for mowing grass on lawns
  14. page number the system of numbering pages
  15. wave number the reciprocal of the wavelength of a wave
  16. Mach number the ratio of the speed of a moving body to the speed of sound
  17. cardinal number the number of elements in a mathematical set
  18. back-number someone who is no longer popular
  19. nucleon number the sum of the number of neutrons and protons in an atomic nucleus
  20. Glenn Miller United States bandleader of a popular big band (1909-1944)