kō- / Indo-European roots
To sharpen, whet.Oldest form *k̑eə3-, colored to *k̑oə3-, contracted to *k̑ō- (becoming *kō- in centum languages).
1. Suffixed extended form *koəi-no-. hone1 from Old English hān, stone, from Germanic *hainō.
2. Possibly Greek kōnos, cone, conical object (< "a sharp-pointed object") cone, conic; conifer, conodont
[Pokorny k̑ē(i)- 541.]