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notochord

[noh-tuh-kawrd]
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noun Embryology.
  1. a rodlike cord of cells that forms the chief axial supporting structure of the body of the lower chordates, as amphioxus and the cyclostomes, and of the embryos of the vertebrates.
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Origin of notochord

1840–50; noto- + chord1 (in the sense of ‘a cordlike anatomical structure’)
Related formsno·to·chord·al, adjectivesub·no·to·chord·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for notochord

Historical Examples

  • They have no backbone in the strict sense, but they have this notochord.

    The Outline of Science, Vol. 1 (of 4)

    J. Arthur Thomson

  • The skeleton is completely ossified and the notochord removed.

    The Elements of Geology

    William Harmon Norton

  • This structure is called the Notochord (a string down the back).

  • Nevertheless, traces of the notochord persist in the back-bone of these fishes.

  • Moreover, this rod was unsegmented, for the notochord is devoid of segmentation.

    The Origin of Vertebrates

    Walter Holbrook Gaskell


British Dictionary definitions for notochord

notochord

noun
  1. a fibrous longitudinal rod in all embryo and some adult chordate animals, immediately above the gut, that supports the body. It is replaced in adult vertebrates by the vertebral column
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Derived Formsnotochordal, adjective
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

Word Origin and History for notochord

n.

1848, coined in English by English anatomist Sir Richard Owen (1804-1892) from chord + comb. form of Greek noton "back," from PIE *not- "buttock, back" (cf. Latin natis "buttock," sopurce of Italian, Spanish nalga, Old French nache "buttock, butt").

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Online Etymology Dictionary, © 2010 Douglas Harper

notochord in Medicine

notochord

(nōtə-kôrd′)
n.
  1. A flexible rodlike structure that forms the main support of the body in the lowest chordates; a primitive backbone.
  2. A similar structure in embryos of higher vertebrates, from which the spinal column develops.
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Related formsno′to•chordal adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

notochord in Science

notochord

[nōtə-kôrd′]
  1. A flexible rodlike structure that forms the main support of the body in all chordates during some stage of their development. In vertebrates, the notochord develops into a true backbone in the embryonic phase. Primitive chordates, such as lancelets and tunicates, retain a notochord throughout their lives.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.