The headword is an adjective in the feminine nominative plural. Same glossing in other lexica (references at Photius rho185 Theodoridis), and in a scholion on Homer, Iliad 9.499. The headword actually occurs in verse 503 there (web address 1, and see pi 291), referring to the personified prayers (*litai/).
cf. generally rho 304, rho 307, rho 318, rho 319.