Penknife

Hastings' Dictionary of the Bible

Penknife Mentioned only in   Jeremiah 36:23 . Orientals use a reed pen in writing, and always carry a knife for the purpose of mending it.

Webster's Dictionary

(n.) A small pocketknife; formerly, a knife used for making and mending quill pens.

King James Dictionary

PEN'KNIFE, n. See Pen and Knife. A small knife used for making and mending pens.

Holman Bible Dictionary

Writing

Cyclopedia of Biblical, Theological and Ecclesiastical Literature

( תִּעִר הִסֹּפֶר , Tdar Has-Sopher,  Jeremiah 36:23). The translation of this phrase by "penknife," is substantially correct, but a more literal rendering, "the scrivener's knife," would have been preferable; this was used to sharpen the point of the writing-reed. (See Knife); (See Writing).