midrib definition

  • noun:
    • The central or principal vein of a leaf.
    • The strengthened vein down the middle of a flower petal or leaf.
    • A continuation for the petiole, extending from the base into the apex of this lamina of a leaf.
    • In botany, the center (the just) rib or nerve of a leaf; a continuation for the petiole, extending from the base towards the apex of this lamina. See nervation.
    • In apiculture, the septum or partition between the two sheets of cells which are within every comb. Phin, Dict. Apiculture, Int., p. xiii.
    • the vein in the middle of a leaf

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    • The leaves when magnified are seen…
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