Bailly
v. ἧμαι.
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LSJ
εἵατο, Ep. 3 pl. pres. and impf. of ἧμαι. εἴατο, Med. form for ἦσαν (impf. of εἰμί sum), read by Aristarch. in Od. 20.106. εἵατο, 3 pl. plpf. Med. of ἕννυμι.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)