Reconstruction:Proto-Slavic/-ьlъ

Etymology
Fossilized doublet of, attached to thematic roots. The *-ь- could reflect either a reduced *-e- or *-i- from i-theme declension. Regionally (especially in East Slavic), the -ь- was often hardened to -ъ- due to the backward influence of -l- (cf. <  or  < ).

Suffix

 * ← *kozь(jь)
 * ← *pětъ(jь)
 * *pelvelъ ←
 * ← *pětъ(jь)
 * *pelvelъ ←
 * *pelvelъ ←
 * *pelvelъ ←