1.a rise of the sea, πλημμυρὶς ἐκ πόντοιο of the wave caused by the rock thrown by the Cyclops, Od.: flood-tide (cf. ῥαχία), opp. to ἄμπωτις (ebb), Hdt.
2.generally, a flood, deluge, Arist.; of tears, Aesch., Eur.
υ^ in Hom., υ_ in attic
Deriv. uncertain: perh. from πλήθω, μύρω.