προούσιος

ον
A. prior to Being, π. καὶ ἀρχὴ τῆς οὐσίας Iamb. Myst. 8.2, cf. 10.5; τὸ π. Anon. in Prm. in Rh.Mus. 47.613.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project