noun Botany.
the central or middle rib of a leaf.

1690–1700; mid- + rib1

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World English Dictionary
midrib (ˈmɪdˌrɪb)
the main vein of a leaf, running down the centre of the blade

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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
The tail exactly resembled the stem or continuation of the midrib of the dead
Leaves are partially eaten or completely eaten to the midrib.
Brown midrib forage sorghum has been shown to contain less lignin is therefore
  more digestible than normal forage sorghum.
They straddle the leaf margin and devour all of the leaflet except the midrib.
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