1. cardinal number the number of elements in a mathematical set
  2. ordinal number the number designating place in an ordered sequence
  3. Cardinal Newman English prelate and theologian who (with John Keble and Edward Pusey) founded the Oxford movement; Newman later turned to Roman Catholicism and became a cardinal (1801-1890)
  4. rational number an integer or the quotient of two integers
  5. irrational number a real number that cannot be expressed as a rational number
  6. cardinal flower North American lobelia having brilliant red flowers
  7. Brinell number measure of the hardness of a material
  8. cardinal tetra small bright red and blue aquarium fish from streams in Brazil and Colombia
  9. cardinal virtue one of the seven preeminent virtues
  10. cardinal grosbeak crested thick-billed North American finch having bright red plumage in the male
  11. natural number the number 1 and any other number obtained by adding 1 to it repeatedly
  12. real number any rational or irrational number
  13. call number a mark consisting of characters written on a book
  14. baryon number a number equal to the difference between the number of baryons and the number of antibaryons in any subatomic structure; it is conserved in all types of particle interactions
  15. cardinal vein any of the major venous channels in primitive adult vertebrates and in embryos of higher vertebrates
  16. cardinal a vivid red color
  17. Cortinarius the largest genus in the Agaricales
  18. cardinalate cardinals collectively
  19. garden lettuce annual or perennial garden plant having succulent leaves used in salads; widely grown
  20. Cardinal Bellarmine Italian cardinal and theologian (1542-1621)