A Roman divinity of the third plowing, about the beginning of September, and the forth plowing, shortly before the equinox. At this time the land was ribbed (lirare) for the reception of the seed, by adding two moldboards to the plow (aratrum auritum), one on each side of the share. The name comes from porca, the ridge between the furrows. See also Reparator, Vervactor.
- Q. Fabius Pictor ap. Servius on Virgil's Georgics i, 21.
- Smith, William. (1870). Dictionary of Greek and Roman Antiquities.