Vein

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1. a vascular tube in a leaf, typically referring to any within the blade except for the midrib.

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The primary vascular tissue of the leaf.
Source: http://www-plb.ucdavis.edu/labs/rost/virtual%20grape%20dreamweaver/Leaves%20Venation.htm

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This picture shows infected veins on pin oak leaves.
Source: http://outreach.missouri.edu/adair/horticulture/diagnosis/veingall.htm