Definition of ylem in English:

ylem

Syllabification: y·lem
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.
    More example sentences
    • We had to use primordial ylem.

Origin

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

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