palmaceous,a.Bot.|pælˈmeɪʃəs| [f.mod.L. Palmāceæfem.pl. (f. L. palma palm n.1) + -ous.] Of or belonging to the family Palmaceæ, Palmæ, or Palms. 1730Martyn in Phil.Trans. XXXVI. 385 The same Botanists have placed the Musa in the Palmaceous Class.1857in Mayne Expos.Lex.