Robert Beekes (with the assistance of Lucien van Beek). Etymological Dictionary of Greek. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
[RB]
Source
Den Danske Ordbog (online). Copenhagen: Det Danske Sprog- og Litteraturselskab: http://ordnet.dk/ddo
[DDO]
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Ancestry Diagram
The element in question is marked in green.
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Map
This map shows the etymological links in a geographic context.