arundinaceous,a.|əˌrʌndɪˈneɪʃəs| [f. L. arundināceus, f.arundo, harundo a reed: see -aceous.] Reed-like, reedy. 1657in Phys.Dict.1693Phil.Trans. XVII. 686 Beesha, whose leaves are arundinaceous.1791tr.Chaptal's Chem. III. 15 Plants..such as the gramineous and arundinaceous.