Definition of merithallus in English:

merithallus

noun

Botany
rare, historical
  • In early theories of plant structure, especially those of C. Gaudichaud-Beaupré (1789–1854): each of three units into which a leaf, or a phyton, was regarded as divisible.

Origin

Mid 19th century; earliest use found in John Balfour (1808–1884), botanist. Irregularly from ancient Greek μερίς part + thallus, after French mérithalle merithal.

Pronunciation

merithallus

/ˌmɛrɪˈθaləs/