R / rŏtātor
noun

rŏtātor

gen. rŏtātōris · gender masculine · decl. 3rd
one who turns; round in a circle; a whirler round
one who turns a thing round in a circle, a whirler round: Bassaridum (Evan), Stat. S. 2, 7, 7; Cassiod. Var. 7, 5.