An adjective with both passive and active meanings (see LSJ s.v.); both seem to be illustrated here.
[1] cf. the scholia to Sophocles, Oedipus at Colonus 489, where the (neuter plural) headword occurs.
[2] Adler prints these six words, as the second part of the entry, without comment. They make up, on the face of it, an unidentifiable quotation, from (one would guess) a version of the story of Theseus sailing to Crete to kill the Minotaur and forgetting his promise to give advance warning, by means of the colour of his sails, of success or failure there. However, the reading a)/pustoi is far from certain: see Theodoridis on Photius, Lexicon alpha2753 (numbered and printed as a discrete entry), also indicating in a note there his belief that the correct reading is a)/pugoi ("buttock-less"), as in Hesychius s.v. This would obviously result in a radically different understanding of the whole phrase, as lemma plus gloss: '"buttock-less"; the Athenians [sc. are called this] from Theseus'; cf. lambda 604.