Bailly
ῆρος [ῠ] adj. m. qui tire, NIC.
Al. 363.
Étym. ἐρύω.
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LSJ
ῆρος, ὁ, that which draws up, ἐ. φάρυγγος, of a strip of papyrus used to induce vomiting, Nic. Al. 363.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)