meiophyllyBot.|ˈmaɪəfɪlɪ| Also mio-. [irreg.f.Gr. µείων less + ϕύλλον leaf + -y. Cf. meiostemonous.] The suppression of one or more leaves in a whorl. 1869Masters Veget. Terat. 396 Meiophylly. A diminished number of leaves in a whorl, occasionally takes place.1879in Stormonth Man.Sci. Terms.