an instrument, working on a similar principle, as for cutting paper

Nope. I was lying, plain and simple. Didn't stop me from saying it, though. In Latin there was such a thang as a defective verb. A defective verb lacked some of the standard forms. The onliest one I can think of is futuo, futuere, but I don't remember where it's defective and it might just be from lack of observed usage. It's not like it was a real literary word.