What is the meaning of Eth?

ISO 639-3 language code for Ethiopian Sign Language.

A letter (capital Ð, small ð) introduced into Old English to represent its dental fricative, then not distinguished from the letter thorn, no longer used in English but still in modern use in Icelandic, the IPA and other phonetic alphabets to represent the voiced dental fricative "th" sound as in the English word then. The letter is also used in Faroese, but is generally silent in that language.

to mate (cattle)

property

eight

scents

scent, odour

hearth

third-person singular preterite indicative of mos (“to go”)

the

he

passive singular preterite conjunct of téit

oath

Source: wiktionary.org