2. (Biol.) Originating from within; increasing by internal
growth.
{Endogenous multiplication} (Biol.), a method of cell
formation, seen in cells having a cell wall. The nucleus
and protoplasm divide into two distinct masses; these in
turn become divided and subdivided, each division becoming
a new cell, until finally the original cell wall is
ruptured and the new cells are liberated (see
{Segmentation}, and Illust. of {Cell Division}, under
{Division}). This mode of growth is characteristic of many
forms of cells, both animal and vegetable.