What's the "een" in Halloween?
late 15c. (implied in perforated), a back-formation from perforation or else from Latin perforatus, past participle of perforare "to bore through, pierce through." Related: Perforating.
perforate per·fo·rate (pûr'fə-rāt')v. per·fo·rat·ed, per·fo·rat·ing, per·fo·rates
To make a hole or holes in, as from injury, disease, or medical procedure.
To pass into or through (a body structure or tissue).