Yliaster

Yliaster is the term coined by Paracelsus which refers to "Prime matter, consisting of body and soul". It is most likely a portmanteau of the Greek hyle (matter) and Latin astrum (star). To Paracelsus, the Iliaster represented the two basic compounds of the cosmos, matter representing "below", and the stars representing "above". Paracelsus says this of the Iliaster while describing how fossils are trapped in wood: