R / rĕcussus
noun

rĕcussus

gen. rĕcussūs · gender masculine · decl. 4th
a striking back; a recoil; rebound
a striking back, a recoil, rebound (only in abl. sing.), Plin. 8, 53, 79, § 214; Fulg. Myth. praef. 1.