Usually means: Primordial cosmic matter; Big Bang.
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We found 23 dictionaries that define the word ylem:

General (16 matching dictionaries)
  1. ylem: Merriam-Webster
  2. ylem: Oxford Learner's Dictionaries
  3. ylem: American Heritage Dictionary of the English Language
  4. ylem: Collins English Dictionary
  5. ylem: Vocabulary.com
  6. Ylem: Wordnik
  7. ylem: Wiktionary
  8. ylem: Webster's New World College Dictionary, 4th Ed.
  9. ylem: Infoplease Dictionary
  10. ylem: Dictionary.com
  11. Ylem (Stockhausen), Ylem (album), Ylem: Wikipedia, the Free Encyclopedia
  12. ylem: Rhymezone
  13. ylem: FreeDictionary.org
  14. ylem: The Phrontistery - A Dictionary of Obscure Words
  15. ylem: Mnemonic Dictionary
  16. ylem: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. ylem: Encyclopedia

Miscellaneous (2 matching dictionaries)
  1. ylem: A Word A Day
  2. ylem: Wordcraft Dictionary

Science (3 matching dictionaries)
  1. Mars Glossary (No longer online)
  2. Ylem: Extragalactic Astronomy
  3. YLEM: Zoom Astronomy Glossary

Slang (1 matching dictionary)
  1. ylem: Urban Dictionary

(Note: See ylems as well.)

Definitions from Wiktionary (ylem)

noun:  (cosmology, now chiefly historical) In the Big Bang theory, the hot and dense plasma that made up the matter in the cosmos following the initial baryogenesis at an early stage of its expansion and cooling, from which the first atoms formed and photons decoupled. The emission of photons in this phase is regarded as the source of the cosmic microwave background.

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