mid·rib

[mid-rib]
noun Botany.
the central or middle rib of a leaf.

Origin:
1690–1700; mid- + rib1

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
midrib (ˈmɪdˌrɪb) [Click for IPA pronunciation guide]
 
n
the main vein of a leaf, running down the centre of the blade

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Midrib is always a great word to know.
So is flibbertigibbet. Does it mean:
a scrap or morsel of food left at a meal.
a chattering or flighty, light-headed person.
American Heritage
Science Dictionary
midrib   (mĭd'rĭb')  Pronunciation Key 
The central or main vein of a leaf, as in eudicots, magnoliids, and ferns. Midribs generally protrude from the underside of leaves with pinnate venation. See more at venation.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Each leaf is composed of five to seven tiny narrow leaflets arranged in pairs
  along a midrib.
The leaflets grow opposite each other from the midrib, with the final one at
  the tip.
On mature plants the leaflets are closely crowded along the midrib.
They straddle the leaf margin and devour all of the leaflet except the midrib.
Images for midrib
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