ustilaginous,a.Bot.|ʌstɪˈlædʒɪnəs| [f.mod.L. Ustilagin-, ustilago + -ous.] 1. Resembling, belonging or allied to, Ustilago. 1857M. J. Berkeley Introd. Crypt. Bot. 323 Besides the Ustilaginous species, there are others.1900B. D. Jackson Gloss.Bot. Terms 283. 2. ‘Affected with ustilago; smutty’ (Cent.Dict.).