invagination
Americannoun
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the act or process of invaginating.
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Embryology. the inward movement of a portion of the wall of a blastula in the formation of a gastrula.
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Pathology. intussusception.
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a form or shape resulting from an infolded tissue.
Etymology
Origin of invagination
First recorded in 1650–60; invaginate + -ion
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The archenteron develops into the alimentary canal, and a mouth opening is formed by invagination of ectoderm at the pole opposite the blastopore of the gastrula.
From Textbooks • Jan. 1, 2015
White arrow denotes the invagination that forms the shell gland.
From Nature • Oct. 3, 2012
White arrow denotes the invagination that forms the shell gland.
From Nature • Oct. 3, 2012
An epiblastic tucking-in at st., the stomodaeum pre-figures the mouth; pr., the proctodaeum, is a similar posterior invagination which will become the anus.
From Text Book of Biology, Part 1: Vertebrata by Wells, H. G. (Herbert George)
Endomesoderm: the inner layer formed by an invagination of the middle portion of the primitive band of the embryo, and from which the endoderm and mesoderm are subsequently differentiated.
From Explanation of Terms Used in Entomology by Smith, John. B.
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
