a character of the runic alphabet (ð) used to represent the voiced dental fricative as in then, mother, bathe. It is used in modern phonetic transcription for the same purpose
Compare theta (sense 2), thorn (sense 5)
edh in American English
(ɛð)
noun
1.
a letter of the Old English alphabet (ð, Ð), from Roman d, D, used to represent the voiced or voiceless apicodental fricative: in Middle English it was replaced by th
2.
the lowercase form of this letter as used in some phonetic alphabets, as the IPA, to represent the voiced apicodental fricative (th)