#element  one of four substances thought in ancient and medieval cosmology to constitute the physical universe; "the alchemists believed that there were four elements"
  supertype:  #substance__matter  that which has mass and occupies space; "an atom is the smallest indivisible unit of matter"
  subtype:  #air.element  (archaic) once thought to be one of four elements composing the universe (Empedocles)
  subtype:  #fire.element  (archaic) once thought to be one of four elements composing the universe (Empedocles)
  subtype:  #earth  (archaic) once thought to be one of four elements composing the universe (Empedocles)
  subtype:  #ether__quintessence  (archaic) the fifth and highest element after air and earth and fire and water; was believed to be the substance composing all heavenly bodies
  subtype:  #water.element  (archaic) once thought to be one of four elements composing the universe (Empedocles)

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