what is histogen
Definition of HISTOGEN. : a zone or clearly delimited region of primary tissue in or from which the specific parts of a plant organ are believed to be produced â see dermatogen, periblem, plerome, histogen theory â compare calyptrogen, corpus, tunica.ADVERTISEMENT.International Scientific Vocabulary hist- + -gen.This word doesn't usually appear in our free dictionary, but the definition from our premium Unabridged Dictionary is offered here on a limited basis.nternational Scientific Vocabulary hist- + -gen. This word doesn't usually appear in our free dictionary, but the definition from our premium Unabridged Dictionary is offered here on a limited basis.