pen·knife 
(pĕnnīf′)
(pĕnnīf′)n.
A small pocketknife.
[So called because it was originally used for cutting quill pens.]
- strong gale
- stronghold
- strong interaction
- strongish
- strongly
- strongman
- strong-minded
- strong-mindedly
- strong-mindedness
- strong nuclear force
- strongpoint
- strong room
- strongroom
- strong safety
- strong side
- strong suit
- strongyle
- strongyloidiasis
- strontianite
- strontic
- strontium
- strontium-90
- strop
- strophanthin
- strophe