\En*dog"e*nous\, a.
1. (Bot.) Increasing by internal growth and elongation at the
   summit, instead of externally, and having no distinction
   of pith, wood, and bark, as the rattan, the palm, the
   cornstalk.

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.