Proto-IE: *k'ēy-
Meaning: to sharpen, to grind
Old Indian: śiśāti, śinoti, śyati `to whet, sharpen', aor. aśāiṣīt, aśāt, aśīta, ptc. śitá-; śāṇa- (L. śāna-) m. `whetstone, grindstone'
Avestan: saēni-š `Spitze, Wipfel'
Other Iranian: NPers sān, afsān, pām, pasān `Wetzstein'
Armenian: sur `scharf'; sur, gen. sroy `Schwert, Dolch, Messer, Rasiermesser'; sair `Schneide'
Old Greek: kō̂no-s m. `Pinienzapfen, Kegel'
Latin: cōs, gen. cōtis f. `Wetz-, Schleifstein', cōtēs/cautēs `spitzer Fels'
Russ. meaning: заострять, точить
