Definition of polyphyllous in US English:

polyphyllous

adjective

Botany
  • 1Of a perianth, calyx, corolla, etc.: having or consisting of many separate members; not united. Opposed to monophyllous, gamophyllous. Compare polypetalous, polysepalous. Now chiefly historical.

  • 2Of a plant, thallus, leaf, etc.: having or consisting of many leaves or leaf-like parts.

Origin

Late 18th century; earliest use found in Thomas Martyn (1735–1825), botanist. From poly- + -phyllous, probably after scientific Latin polyphyllus in plant names.

Pronunciation

polyphyllous

/ˌpɒlɪˈfɪləs/