|Jereo koa : Kerf|
Old English cyrf (“a cutting off, a cutting instrument”).
- the groove or slit created by cutting a workpiece; an incision
- 1999: They pass through a cleft that has been made across a low range of hills, like a kerf in the top of a log, and enter into a lovely territory of subtly swelling emerald green fields strewn randomly with small white capsules that he takes to be sheep. — Neal Stephenson, Cryptonomicon