-ean, suffix
Var. of -an, after L. -aeus, -eus, orig. representing -e- (in names ending in -(a)ea, -es, -eus) + -an, as antipodean, crustacean, European, Herculean, Linn(a)ean, Promethean; also added to names in -as, -os, -us after Gr. -eios, -aios, as Pythagorean, Sisyphean, Theocritean, etc.