invagination

American  

[in-vaj-uh-ney-shuhn] / ɪnˌvædʒ əˈneɪ ʃən /

noun

1. the act or process of invaginating.

2. Embryology. the inward movement of a portion of the wall of a blastula in the formation of a gastrula.

3. Pathology. intussusception.

4. a form or shape resulting from an infolded tissue.

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invagination British  

/ ɪnˌvædʒɪˈneɪʃən /

noun

1. pathol the process of invaginating or the condition of being invaginated; intussusception

2. pathol an invaginated organ or part

3. an infolding of the outer layer of cells of an organism or part of an organism so as to form a pocket in the surface, as in the embryonic development of a gastrula from a blastula

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Etymology

Origin of invagination

First recorded in 1650–60; invaginate + -ion

Example Sentences

See Examples For:

invagination

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

This process must be regarded as equivalent to the first stage of invagination, the yolk being surrounded by hypoblast cells or their nuclei.

From Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" by Various

These two particular symptoms serve to distinguish this affection from enteritis and invagination of the bowel.

From Special Report on Diseases of Cattle by United States. Bureau of Animal Industry

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.