Compositional etymology which differs from Herodian's (see ἀηδών / ἀείδω) by the fact it starts from the contracted Attic form ᾄδω, not from the uncontracted Homeric and poetic form ἀείδω. Therefore the [ē] had to be accounted for. This was done by assuming that the first element was the adverb ἀεί "always", pronounces [ai] in Late Greek, and identical with the initial sequence of [aidōn] because of iotacism. The "in summer and in winter" comes as a justification of ἀεί