Aorist active participle(s), masculine nominative singular.
As transmitted, the headword occurs only here (and, according to Adler, in the Ambrosian Lexicon) -- and alphabetical order requires it occupy this position in the rhos. Nevertheless, it should be r(aibw/sas, as in Lycophron, Alexandra 563; see the scholia there, with the same gloss as the present one. The Etymologicum Magnum and ps.-Zonaras also read r(aibw/sas.
cf. generally rho 72.