• synonyms


noun Botany.
  1. the central or middle rib of a leaf.
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Origin of midrib

First recorded in 1690–1700; mid- + rib1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for midrib

Historical Examples

  • Wire must also be laid on all the side ribs or veins leading to the midrib.

    The Ladies Book of Useful Information


  • The other way of working a leaf is to outline the midrib first.

  • The veins, and notably the midrib of the limb of the sepals, united underneath.

    Everyday Objects

    W. H. Davenport Adams

  • It differs from Delesseria alata in having no midrib or veins.

    The Sea-beach at Ebb-tide

    Augusta Foote Arnold

  • Having veins extending from the midrib to the margin, feather-wise.

    Michigan Trees

    Charles Herbert Otis

British Dictionary definitions for midrib


  1. the main vein of a leaf, running down the centre of the blade
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

midrib in Science


  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.