*skel- 1

also colter, "iron blade or sharp-edged wheel attached to the beam of a plow to cut the ground," Old English culter, from Latin culter "a knife, iron blade in a plowshare," from PIE root *skel- (1) "to cut." As a surname (13c.), probably from Coulter in Lancashire.

"short sword or large knife with a flat, wide, slightly curved blade," used for cutting more than thrusting, 1590s, from French coutelas (16c.), which is probably from Italian coltellaccio "large knife," with augmentative suffix -accio + coltello "knife," from Latin cultellus "small knife," diminutive of culter "knife, plowshare," from PIE *kel-tro-, suffixed form of root *skel- (1) "to cut." Not related to cut.