noun, plural rachillae [ruh-kil-ee] . Botany.
a small or secondary rachis, as the axis of a spikelet in a grass inflorescence.

1835–45; < Neo-Latin, diminutive of rachis rachis

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World English Dictionary
rachilla or rhachilla (rəˈkɪlə)
(in grasses) the short stem of a spikelet that bears the florets
[C19: from New Latin, diminutive of rachis]
rhachilla or rhachilla
[C19: from New Latin, diminutive of rachis]

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American Heritage
Science Dictionary
rachilla   (rə-kĭl'ə)  Pronunciation Key 
Plural rachillae (rə-kĭl'ē)
The stalk that bears the florets in the spikelets of grasses and similar plants, such as rushes and sedges. The rachilla often has a zigzag shape, with florets at each point at which the orientation of the rachilla turns.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It has a mid-sized to small kernel and the rachilla is mid to long with long hairs.
Kernels have adhering, finely wrinkled hulls and long rachilla hairs.
Only the portion of the rachilla that bears flowers is exposed.
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