[1] Dative singular of e(ce/ths, probably quoted from Aristophanes (see next note). For the gloss cf. scholion on Homer, Iliad 23.266, where this adjective is used of a horse (web address 1).
[2] Aristophanes, Clouds 862 (web address 2), with scholion. The word is attested as barytone (accented on the next-to-last syllable) or oxytone (accented on the last syllable). Grammarians discuss this variation in compounds of e)/tos "year." Some say that it is a difference of dialect, as the lexicographer implies here. Pollux 1.54, discussing trie/ths/trieth/s, says that the paroxytone form means a three-year period of time, but the oxytone form is applied to three-year-old persons, animals, and plants; but this distinction does not seem to be observed in practice.
[3] Aristophanes, Lysistrata 280 (web address 3), with scholion.