ἐπέρεισις

εως, ἡ
A. pressure, Dsc. 5.77, Sor. 2.10, Heliod. ap. Orib. 10.37.7, Gal. 2.386; of the objects of sense, impact, Chrysipp.Stoic. 2.233, al.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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