Proto-Basque: *tanka ~ *tanko
Meaning: 1 drop (of liquid) 2 a little (bit) 3 a moment
Bizkaian: (Arratia, Orozko, Txorierri) tanga 1, (Arratia, Orozko) tanka 2, (Arratia, Galdakano, Mundaka) tango 2, (Arratia, Galdakano) 3
Zuberoan: tanka 1
Roncalese: (Uztárroz) tanka 1
Comments: A relic etymon, preserved only at the western (BZK) and eastern (ZBR, RNC) peripheries.