The headword is a neuter noun in the nominative (and vocative and accusative) plural; see generally LSJ s.v. pro/quma. The entry comes from the scholia vetera to Aristophanes, Plutus [Wealth] 660 (Cario describes his sacrifices: web address 1), where the headword occurs.
[1] The gloss is a feminine noun in the nominative (and vocative) plural (where English idiom would have singular, as translated here); see generally LSJ s.v. o)/lura. Rice-wheat, or olyra, is probably einkorn wheat (or one of several closely related varieties), Triticum monococcum, an ancient domesticated grain that tolerates poor soils; see Zohary, et al., pp. 34-9 and Theophrastus, Enquiry into Plants 8.9.2.