mononomial
/mɒnə(ʊ)ˈnəʊmɪəl/noun
1 Mathematics = monomial. rare.
2Chiefly Taxonomy. A name or expression consisting of one word only.
adjective
Chiefly Taxonomy. Designating a name or expression consisting of one word only.
Origin
Mid 19th century; earliest use found in Thomas De Quincey (1785–1859), essayist. From mono- + -nomial, as alteration of monomial.