C / concussus
noun

concussus

gen. concussūs · gender masculine · decl. 4th
a shaking, concussion;
a shaking, concussion; only in abl. sing. in Lucr. 6, 290; 6, 547 (in Plin. 35, 16, 55, § 193, the better read. is concussis; v. Sillig ad h. l.).