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A form of matter hypothesized by proponents of the Big Bang theory to have existed before the formation of the chemical elements.
[Middle English, universal matter, from Old French ilem, from Medieval Latin hȳlem, accusative of hȳlē, matter, from Greek hūlē.]
(Astronomy) the original matter from which the basic elements are said to have been formed following the explosion postulated in the big bang theory of cosmology
[Middle English, from Old French ilem, from Latin hӯlē stuff, matter, from Greek hulē wood, matter]
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|Noun||1.||ylem - (cosmology) the original matter that (according to the big bang theory) existed before the formation of the chemical elements|
matter - that which has mass and occupies space; "physicists study both the nature of matter and the forces which govern it"