Last modified on 18 June 2013, at 02:05




cactoid (plural cactoids)

  1. A member of the cactus subfamily Cactoideae.
  2. (topology) This term needs a definition. Please help out and add a definition, then remove the text {{rfdef}}.
    • 1951, John William Theodore Youngs, The Representation Problem for Fréchet Surfaces (page 27)
      It is well known that a Peano space is a cactoid if and only if each of its true cyclic elements is a 2-sphere.