aphyllous,a.Bot.|əˈfɪləs| [f.mod.L. aphyllus, a. Gr. ἄϕυλλ-ος leafless (f. ἀ not + ϕύλλον leaf) + -ous.] Destitute of leaves, naturally leafless. 1830Lindley Nat.Syst.Bot. 29 Cassytha is aphyllous and parasitical.1836Todd Cycl.Anat. & Phys. I. 132/2 Those plants that are aphyllous.