The Collaborative International Dictionary of English v.0.48:

Endogeny \En*dog"e*ny\, n. [See Endogenesis.] (Biol.)
   Growth from within; multiplication of cells by endogenous
   division, as in the development of one or more cells in the
   interior of a parent cell.
   [1913 Webster]

WordNet (r) 3.0 (2006):

endogeny
    n 1: a geological phenomenon below the surface of the earth