invagination

名词 invagination:

1. the condition of being folded inward or sheathed
   同义词：introversion
2. the folding in of an outer layer so as to form a pocket in the surface
   同义词：introversion, intussusception, infolding

in.vag.i.na.tion

n.（名词）
The act or process of invaginating or the condition of being invaginated.
入鞘：使入鞘的动作或过程或被装入鞘中的状态
An invaginated organ or part.
缩入部分：反折的器官或部分
Embryology The infolding of a portion of the outer layer of a blastula in the formation of a gastrula.
【胚胎学】 肠套叠：在原肠胚形成过程中囊胚的外层的折叠部分