Same entry in other lexica. The headword is third person plural, present indicative middle/passive, of the doubly compound verb e)napomo/rgnumi, I wipe off upon or impart to. It must be quoted from somewhere. (The only extant instance outside lexica occurs in one of the Letters attributed to Dionysius the Areopagite.)
More generally for this verb see e.g. Iamblichus, On mysteries 5.3 (quoted by Stobaeus 3.3.26), of a colour; John Chrysostom, On virginity 71; Porphyry, Sententiae 29.12; Proclus, Eclogae fr.3.24; Stobaeus 1.49.55; Synesius, On insomnia 7.24, 19.17.