noun.
A small pocketknife; a small knife with a blade which folds into the hand. Penknives often incorporate other tools such as corkscrews, and are generally smaller than pocketknives as a group.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a small pocketknife; originally used to cut quill pens
Word Usage
"But his penknife was a tiny thing, suitable for sharpening quills and cutting paper, not to doing battle with monstrous stone dogs."