monotrichous mo·not·ri·chous (mə-nŏt'rĭ-kəs) or mon·o·trich·ic (mŏn'ə-trĭk'ĭk) or mo·not·ri·chate (mə-nŏt'rĭ-kĭt) adj. Having a single flagellum at only one pole or end. Used of certain bacteria.