1) Blade 2) Pocketknife 1) Item with a folding blade 2) Pocket item 3) Pocket knife 4) Pocket tool 5) Pocketknife 6) Pocket knife 7) Quill cutter, once 
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 p...
• (n.) A small pocketknife; formerly, a knife used for making and mending quill pens.
Pen'knife` noun ; plural Penknives . [ Pen + knife .] A small pocketknife; formerly, a knife used for making and mending quill pens. 
[n] - a small pocketknife
noun a small pocketknife; originally used to cut quill pens