Entry also in Hesychius and, according to Adler, the Ambrosian Lexicon.
The headword is the contracted form of the present infinitive of ple/w; the gloss is the uncontracted form. See also upsilon 717.
The root is *plew-/plow-, cf. plo/os at pi 1789. Cognates include Sanskrit plávate "floats" or "swims," Latin pluit "it rains," and English "flood."