Definition of rachilla in US English:

rachilla

(also rhachilla)

noun

Botany
  • In grasses: the floral axis, i.e. the axis on which the florets are borne within the spikelet. Also (in palms): the ultimate flower-bearing axis of the inflorescence.

Origin

Mid 19th century; earliest use found in William T. Brande (1788–1866), chemist. From scientific Latin rachilla from post-classical Latin rachis + -illa.

Pronunciation

rachilla

/rəˈkɪlə/