Proto-Basque: *gilc
Meaning: 1 key (of a lock) 2 keystone (of an arch)
Bizkaian: giltz 1, 2
Gipuzkoan: giltza 2
High Navarrese: giltza 1, 2
Low Navarrese: giltz, gilz 1
Lapurdian: giltz 2
Baztanese: gilz 1
Zuberoan: giltz 1
Roncalese: giltz 1
Comments: Bsq (c) giltz 'joint, node (of bones, plants)' is probably an anatomical extension of this word..
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