preplanetary

Meaning

1. adjective Before the existence or formation of planets.
2. adjective Relating to a stage in the life of a red giant star or its preplanetary nebula during the star's final stages of life

Similar words

pre-planetary proplanetary prebiotic precellular precreative prebiological precosmic pre-hexameral prestellar pregalactic

Often followed by

stage disk bodies material nebula matter