Definition of ylem in English:

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ylem

Pronunciation: /ˈīləm/

noun

Astronomy
(In the Big Bang theory) the primordial matter of the universe, originally conceived as composed of neutrons at high temperature and density.
Example sentences
  • We had to use primordial ylem.

Origin

1940s: from late Latin hylem (accusative) 'matter', from Greek hūlē.

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