The headword is a feminine noun in the nominative singular; see pi 442 and pi 443 for other meanings and, generally, LSJ s.v. If the Timaeus entry (see next note) permits the inference that a passage in Plato lies behind the present entry, it will presumably be Laws 855C (accusative plural); but in fact, despite Timaeus' title, the inference is not mandatory.
[1] The headword is identically glossed in Timaeus' Platonic Lexicon (pi999a13) and in Photius' Lexicon (pi301 Theodoridis), except that (as Adler notes) these lexica read para/ tina: over someone.