Proto-Basque: *kVl
Meaning: 1 shell (of egg, nut) 2 bark (of tree) 3 (finger-)nail 4 empty chestnut, chestnut shell 5 husk (of maize) 6 chestnut burr
Bizkaian: oskol 1, atz-oskol 3, mokol 1, 5, mokolo 5, koskol 4
Gipuzkoan: koskol 4, 6
High Navarrese: oskol 2
Baztanese: akal 4
Comments: Various compounds (*oś-kol, *koś-kol, *mo-kol(o), *a-kal) involving the element *kVl < PSC *q̇wăɫV́. *mo- and *a- could represent fossilized class prefixes.
