Palmárius, Adiectiuum. That is anhand breadth in measure. vt Palmarium spatium. Colum. The space of an handbreath.
Lewis and Short: Latin dictionary
palmārĭus, a, um, adj. [id.], of or belonging to palms: Insula Palmaria, the Isle of Palms in the Tyrrhenian Sea, now Palmarola, Varr. R. R. 3, 5, 7; Plin. 3, 6, 12, 81.—II.Transf., subst.: palmārĭ-um, ii, n.A.That which deserves the prize, a masterpiece: id vero est, quod ego mihi puto palmarium, Ter. Eun. 5, 4, 8.— B.The fee of a successful advocate, Dig. 50, 13, 1, 12; cf. palmarium, a)cio/nikon, Gloss. Philox.