ἐπανσιδέω

A. swell up, rise on the surface, Hp. Nat.Mul. 2, Arist. HA 531b3:—Pass., ἐπαν‐οιδίσκομαι in same sense, Hp. VC 13.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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