penknife -
a small pocketknife; originally used to cut quill pens
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Wiktionary
Substantiv
penknife -
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.
Wikipedia
A penknife, or pen knife, is a small folding pocket knife, originally used for cutting or sharpening a quill to make a pen nib. Originally, penknives did not necessarily have folding blades, but resembled a scalpel or wood knife by having a short, fixed blade at the end of a long handle. These knives were used for thinning and pointing quills to prepare them for use as writing instruments and, later, for repairing or re-pointing the quills.