The headword form -- attested only in lexica and grammars -- is the present indicative (and subjunctive) active, first person singular, of this epic/poetic verb. See generally LSJ s.v., and other forms at pi 2262 (end) and pi 2266.
[1] The headword is identically glossed by ps.-Zonaras 1585.22 and similarly glossed by ps.-Herodian, Partitiones 111.11; cf. Etymologicum Gudianum 478.58. Adler also cites Lexicon Ambrosianum 1371.