2 example sentences using rachis.

Rachis used in a sentence

Rachis in a sentence as a noun

"...The feathers lack the well-developed central shaft - a rachis - known from modern birds.

Their structure suggests that the two finest tiers of branching in modern feathers, known as barbs and barbules, arose before the rachis formed.

Rachis definitions

noun

axis of a compound leaf or compound inflorescence

noun

the series of vertebrae forming the axis of the skeleton and protecting the spinal cord; "the fall broke his back"

See also: spine backbone back