COMMENT: Reconstructed for the PEC level. Correspondences are regular. There exists also a PEC nominal derivate *(ʔō)cV̄ɫV, reflected in PN *cēl and Av. χ:arí-cel.
Deeters (1957, 390) compared the EC forms with PK *cel- 'to mow; scythe'. If the PK verbal stem is actually denominative (see Dzhavakhishvili 1, 272, 2, 91), it is most probably borrowed from an EC source. See Klimov 1965, 223.