Definition of protophyll in US English:

protophyll

noun

Botany
  • In a clubmoss: a primitive leaf-like structure produced on the upper surface of the protocorm or tuber.

Origin

Late 19th century; earliest use found in Frederic Bower (1855–1948), botanist. From proto- + -phyll.

Pronunciation

protophyll

/ˈprəʊtə(ʊ)fɪl/