Hypertext Webster Gateway: "midrib"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Midrib \Mid"rib`\, n. (Bot.)
A continuation of the petiole, extending from the base to the
apex of the lamina of a leaf.
From WordNet (r) 1.7 (wn)
midrib
n : the vein in the center of a leaf
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