Proto-IE: *udr-
Meaning: otter
Old Indian: udrá- m. `a k. of aquatic animal, otter'; Vaygali wacakok 'Otter'
Avestan: udra- 'Otter', Osset wyrd, urdä 'Otter'
Old Greek: hǘdro-s m. `Wasserschlange, Coluber nutrix', hǘdrǟ f. `Wasserschlange'
Latin: lutra f. `Fischotter'
Celtic: *udro- `Ottenfarbe' > Ir odar `dunkelfärbig, braun'
Russ. meaning: зверек (выдра)
References: WP I 252 f
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