† perˈfossionObs.rare. [ad. late L. perfossiōn-em, n. of action from perfodĕre to dig through, f. per- 1 + fodĕre to dig.] A digging or boring through; perforation. 1695J. Edwards Perfect. Script. 249 The females under⁓went troublesome..perfossions in the lappets of their ears.