Eadhadh

Eadhadh is the Irish

Irish language

Irish , also known as Irish Gaelic, is a Goidelic language of the Indo-European language family, originating in Ireland and historically spoken by the Irish people. Irish is now spoken as a first language by a minority of Irish people, as well as being a second language of a larger proportion of...

 name of the twenty-fourth letter of the Ogham

Ogham

Ogham is an Early Medieval alphabet used primarily to write the Old Irish language, and occasionally the Brythonic language. Ogham is sometimes called the "Celtic Tree Alphabet", based on a High Medieval Bríatharogam tradition ascribing names of trees to the individual letters.There are roughly...

 alphabet, . In Old Irish, the letter name was Edad. Its phonetic value is [e].

The original meaning of the letter name is unknown, but it is likely influenced by Idad, much like Gothic pairþra, qairþra, together with which it forms the coda of the Briatharogaim.

The "arboreal" glossators assign crand fir no crithach "'true tree' or aspen

Aspen

Populus section Populus, of the Populus genus, includes the aspen trees and the white poplar Populus alba. The five typical aspens are all native to cold regions with cool summers, in the north of the Northern Hemisphere, extending south at high altitudes in the mountains. The White Poplar, by...

".