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Dair is the Irish name of the seventh letter of the Ogham alphabet, ᚇ, meaning "oak", which is related to Welsh derw(en). Its Proto-Indo-European root was *deru- 'oak'. Its phonetic value is [d]. Ogham (Old Irish Ogam) was an alphabet used primarily to represent Gaelic languages. ... Note: This article contains special characters. ... Note: This article contains special characters. ... Ogham (Old Irish Ogam) was an alphabet used primarily to represent Gaelic languages. ... Species See List of Quercus species The term oak can be used as part of the common name of any of several hundred species of trees and shrubs in the genus Quercus, and some related genera, notably Lithocarpus. ... Welsh redirects here, and this article describes the Welsh language. ... The Proto-Indo-Europeans are the hypothetical speakers of the reconstructed Proto-Indo-European language, a prehistoric people of the late Neolithic and early Bronze Age. ...