01 n. The condition of an invaginated organ or part.
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1.
The condition of an invaginated organ or part.(Biol.)
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2.
The inward movement of the wall of a tissue or cell, to form a cavity; also, the cavity thus formed.
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3.
The inward movement of one part of the wall of a blastula, to form a gastrula; the process of gastrulation, in which layers of the ovum are differentiated.(Biol., Embryology)