Definition of monophyllous in English:

monophyllous

adjective

Botany
  • 1Of a plant: having a single leaf or leaflet. Also (of a tree's canopy): consisting of a single layer of leaves. Now rare.

  • 2Of a foliose lichen: having a thallus with a single leaflike lobe.

Origin

Mid 18th century (in an earlier sense). From mono- + -phyllous.