Lewis Short
praemĕtĭum | praemessum (noun N) : (al. ‡ ), , prae-metior
* The offering of the firstfruits measured out beforehand for Ceres: praemetium quod praelibationis causā ante praemetitur, Paul. ex Fest. p. 235 Müll.; cf.: praemetium de spicis, quas primum messuissent, sacrificabant Cereri,id. ib. s. v. sacrima, p. 319 ib.; and: praemetium (al. praemetivum), ἡ πρὸ θερισμοῦ Δημήτρας θυσία, Gloss. Philox.
Charlton T. Lewis, Charles Short, A Latin Dictionary