The oceans of the earth at a time early in its history. The term generally implies either the time before or during the development of multi-cellular life forms (i.e., during the Precambrian), or alternatively before the development of the first land-based life forms (i.e. during the early Paleozoic).

plural of primordial soup

plural of primordial sea

plural of primordial black hole

A black hole which is formed by direct collapse of primordial gas and dark matter, before the first stars ever formed, in a Big Bang universe.