C / collīsĭo
noun

collīsĭo

gen. collīsōnis · gender feminine · decl. 3rd
(), , collido
a dashing; striking together; a concussion
a dashing or striking together, a concussion, shock: partūs abjecti, Just. 11, 12, 6.—
by extension
Transf., of letters in a word: πνεῖν, χεἰν, ῥεῖν, non sunt integra, sed ex collisione contracta. Macr. Diff. 19, § 17.