Noun ivory has 2 senses
  1. ivory, tusk - a hard smooth ivory colored dentine that makes up most of the tusks of elephants and walruses
    --1 is a kind of dentine, dentin
    --1 is a substance of tusk
  2. bone, ivory, pearl, off-white - a shade of white the color of bleached bones
    --2 is a kind of white, whiteness