[1880–85; endo- + -geny]This word is first recorded in the period 1880–85. Other words that entered Englishat around the same time include: Chief of Staff, barnstorm, highball, impressionism, quotation markendo- is a combining form meaning “within,” used in the formation of compound words. Otherwords that use the affix endo- include: endobiotic, endocentric, endodermis, endosome, endothecium; -geny is a combining form meaning “origin,” used in the formation of compound words. Otherwords that use the affix -geny include: epeirogeny, hyperosteogeny, odontogeny, orogeny, phylogeny