monophyllous,a.|mɒnəʊˈfɪləs| [f.Gr. µονόϕυλλ-ος (f. µόνο-ς mono- + ϕύλλον leaf) + -ous.] Of a calyx: Consisting of one leaf. 1746Hill in Phil.Trans. XLIV. 63 This Ring is truly a monophyllous undulated Calyx.1830Lindley Nat.Syst.Bot. 216 Calyx monophyllous, divided.