The headword, an accusative plural form of the noun prwqh/bhs (as in the quotation that follows), is difficult to render with a single English noun. Literally 'first-youths', i.e. those in the first stage of young manhood. The lemma, unglossed here, may be a remnant of an entry similar to Hesychius pi4132, Synagoge pi349, and Photius pi1234 Theodoridis, deriving from commentary on Homer, Iliad 8.518 (where the headword occurs in this case and number). For more on this noun see the next entry, pi 2943.
[1] An abridgement (in Adler's opinion via the Excerpta of Constantine Porphyrogenitus) of Appian, Iberica 274. The passage refers to the campaigns of Q. Fabius Maximus Aemilianus in Iberia (142 BCE).