"The PIE root is *sneh₂- 'swim' (cf. PCelt. *snā-yo-)" (RM), "The PIE root is *sneh₂- 'swim' (cf. PCelt. *snā-yo-)" (RM). But GK considers PGm. *nadra- m. ‘adder, snake’ < proto-form. *nh̥1tr-ó- to be "a West European word of uncertain origin".
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This map shows the etymological links in a geographic context.