Ἰςιακός

ή, όν, Subst., ὁ
A. of or for Isis, σύνοδος IGRom. 1.1303 (Philae, i B.C.): Subst. Ἰς‐κός, ὁ, priest of Isis, Dsc. 3.23, Plu. 2.352b.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project