"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".
An Stòr-dàta Briathrachais Gàidhlig: http://www2.smo.uhi.ac.uk/gaidhlig/faclair/sbg/lorg.php
[AFB]
Source
Michiel de Vaan. Etymological Dictionary of Latin and the other Italic Languages. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
[MDV]
Source
Dictionary of the Irish language: based mainly on old and middle Irish materials. (1913-1976). Dublin: Royal Irish Academy. Online at: http://edil.qub.ac.uk/dictionary/search.php
[EDIL]
Source
Guus Kroonen. Etymological Dictionary of Proto-Germanic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
[GK]
Source
Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online: http://iedo.brillonline.nl.ludwig.lub.lu.se/dictionaries/content/proto-celtic/index.html
[RM]
Source
Ó Dónaill, Niall & De Bhaldraithe, Tomás (red.) (1977). Foclóir Gaeilge-Béarla. Baile Átha Cliath: An Rún.
[FGB]
Source
Jehan Lagadec. 1867. Le Catholicon de Iehan de Lagadeuc : dictionnaire breton, français et latin publié par R. F. Le Men d'après l'édition de Me Auffret de Quoetqueveran. Lorient: Ed. Corfmat.
[CAT]
Source
Robert Farren, PIE culture words collection, 2017
[Farren (2017)]
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