Naxium, xij, n. g. A kinde of whetstones in the Ile of Cyprus.
Lewis and Short: Latin dictionary
naxĭum, ii, n., a stone used for polishing marble, which was found on the island of Cyprus and prepared in the city of Naxos, in Crete, Plin. 36, 7, 10, 54; 37, 8, 32, 109.