frusta

/F R AH1 S T AH0/
noun
  1. 1

    A cone or pyramid whose tip has been truncated by a plane parallel to its base.

  2. 2

    A portion of a sphere, or in general any solid, delimited by two parallel planes.

Source: https://en.wiktionary.org/wiki/frusta, https://en.wiktionary.org/wiki/frustum