|1.||[ noun ] (biology) growth in the surface area of a cell by the deposit of new particles between existing particles in the cell wall|
|Related terms:||growth biology|
|2.||[ noun ] (biology) the folding in of an outer layer so as to form a pocket in the surface|
|Synonyms:||infolding introversion invagination|
"the invagination of the blastula"
|Related terms:||organic_process change_of_shape intussuscept|