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
Further cell-divisions occur, and the invagination becomes deeper, until the invaginating wall nearly touches the wall which has retained its primitive position.
From The Biological Problem of To-day Preformation Or Epigenesis? The Basis of a Theory of Organic Development by Hertwig, Oscar
The invagination above the diaphragm, consisting of both endocyst and ectocyst, is then everted.
From Freshwater Sponges, Hydroids & Polyzoa by Annandale, Nelson
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.
