The headword is an epic-dialect equivalent of the Attic present middle/passive participle ponou/menon, here in the masculine accusative singular. Its first occurrence is in Homer Iliad 4.374, but the glossing of the scholia is different there. The Suda's gloss is the one used by the scholia to Oppian, Halieutica 2.441, where it also occurs. (See also Nicander, Theriaca 808.)
For the same headword and gloss in the nominative case see Homer, Iliad 13.288, with scholion (and Etymologicum Magnum 200.2-3), quoted under epsilon 1025.