"One might suggest that ezn earlier had feminine (or generic) semantics" (HKM), This etymology is a subject for debate. For Martirosyan, Skt. ahī́- 'cow, female of an animal' and Av. azī- 'milking (of cows and mares)' are possible cognates of the Armenian word, but "the appurtenance of OIr. ag n. 'cow, cattle' (< *aģhes-) is uncertain". Mallory-Adams resolves these difficulties as follows: "This word is usually reconstructed as *haeģh- but such a reconstruction makes it impossible to include Arm ezn 'cow'. The Indo-Iranian forms are ambiguous as to whether the initial vowel was *h₁e- or *hae-; only the Celtic seems to require *hae-. However, there is some precedent for an initial *e- appearing as a- in Celtic, cf. OIr aig 'ice' from *yegi-. As the word is attested at the margins of the IE world this strongly suggests PIE status." (Quoted by AB).
Allan R. Bomhard. Reconstructing Proto-Nostratic, Comparative Phonology, Morphology, and Vocabulary. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Hrach K. Martirosyan. Etymological Dictionary of the Armenian Inherited Lexicon. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online: http://iedo.brillonline.nl.ludwig.lub.lu.se/dictionaries/content/proto-celtic/index.html
Robert Farren, PIE culture words collection, 2017
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