ONTOGENY By N., Pam M.S. - April 7, 2013 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 PHYLOGENY BCL-2 DEATH ONTOGENETIC PSYCHOLOGY PREFORMISM OLFACTORY RECEPTOR VIRUS OLIGOENCEPHALY CONTRACEPTION POOLED VARIANCE Cite this page: N., Pam M.S., "ONTOGENY," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/ontogeny/ (accessed February 20, 2020).