notochord [ noh-t uh-kawrd ] SHOW IPA / ˈnoʊ təˌkɔrd / PHONETIC RESPELLING EXAMPLES | WORD ORIGIN noun . Embryology 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. Origin of notochord 1840–50; noto-
(in the sense of ‘a cordlike anatomical structure’)
Related forms no·to·chord·al, adjective sub·no·to·chord·al, adjective
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for notochord British Dictionary definitions for notochord noun 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 Derived Forms notochordal, adjective
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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").
Online Etymology Dictionary, © 2010 Douglas Harper
Medicine definitions for notochord n. A flexible rodlike structure that forms the main support of the body in the lowest chordates; a primitive backbone. A similar structure in embryos of higher vertebrates, from which the spinal column develops. Related forms no′to•chord ′al adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Science definitions for notochord 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.
The American Heritage® Science Dictionary
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