ONTOGENY By N., Sam M.S. - 29 noun. the biological root and growth of a living being from fertilization of the egg cell to death. Commonly referred to as ontogenesis. ONTOGENY: "Ontogeny is not a common course of study for any degree program." Related Psychology Terms Discrimination and Mental Illness in the LGBT Population A Comparison of Maternal and Paternal Filicide ADOLESCENCE (Theories) Evaluation of a Qualitative Study Selecting a Diagnosis READING DISABILITY (Paralexia, Dyslexia) EXOTIC PSYCHOSES LANGUAGE (Psycholinguistics) The Anatomy of Research and the Scientific Method FREUD, SIGMUND (1856-1939) Cite this page: N., Sam M.S., "ONTOGENY," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/ontogeny/ (accessed February 2, 2023).