GRC

ἐχεσαμία

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LSJ

ὅτε θέρους ὄντος ψεκάσῃ ἢ βροντήσῃ, Hsch. (i.e. a sign which causes public business to be suspended, cf. διοσημία).
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
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