Ylem

In the 1980s, I visited the Flintstones' Bedrock City in Chilliwack, BC. "Chilliwack" comes from the Amerindian Halq'eméylem word "Ts'elxwéyeqw" meaning "as going as far as you can go upriver."

Source: tatoeba (10668482)

Very shortly after the beginning of the universal expansion, the ylem was a gas of neutrons only. [Footnote: According to Webster's New International Dictionary, 2nd Ed., the word ‘ylem’ is an obsolete noun meaning ‘The primordial substance from which the elements were formed.’ It seems highly desirable that a word of so appropriate a meaning be resurrected.]

Source: wiktionary

Let us now consider the state of matter during the first minutes of the expansion process, when the temperature of the universe was many billions of degrees high. […] [T]he state of matter must be visualized as a hot gas formed entirely by nuclear particles; that is, protons, neutrons, and electrons. […] We will call this primordial mixture of nuclear particles "Ylem," [footnote: Pronounced: ī′lěm] reviving an obsolete noun which, according to Webster's Dictionary, means "the first substance from which the elements were supposed to be formed." Next we can ask what happened to the Ylem when its density and temperature began to drop as the result of the rapid expansion taking place in the young universe.

Source: wiktionary

The ylem was the primordial flux of neutrons out of which all else emerged.

Source: wiktionary