1) OE letter 2) Anglo-Saxon fricative 3) Anglo-Saxon letter 4) Crossed d letter 5) Dead letter 6) Defunct letter 7) Icelandic letter 8) Letter in runes 9) Old english letter 10) Old letter 11) Old saxon letter 12) Old-english letter 13) Th in Old English 14) Thorn of letters 15) Thorn of yore 16) Thorn relative Found on https://www.crosswordclues.com/clue/edh
• (n.) The name of the Anglo-Saxon letter /, capital form /. It is sounded as `English th in a similar word: //er, other, d//, doth.` Found on http://thinkexist.com/dictionary/meaning/edh/
Edh noun The name of the Anglo- Saxon letter ð, capital form Ã?. It is sounded as 'English th in a similar word: ōðer, other, dôð, doth.' March. Found on http://www.encyclo.co.uk/webster/E/9