[1] The headword is aorist passive participle of truxo/w, masculine nominative singular. It has the same glossing in Photius (tau535 Theodoridis) and elsewhere, and must be quoted from somewhere -- perhaps (as Theodoridis suggests) Gregory of Nyssa, On Saint Ephraim (PG 46,841): gh/ra| truxwqei/s. In any event, the import of the second glossing participle is unclear.
[2] "Perispomenon" verbs are what we call contract verbs, which have a circumflex accent on the last syllable. Regular thematic verbs are "barytone," meaning without an accent on the last syllable. (For tru/xw see tau 1121.)