ontogeny
noun
on·tog·e·ny än-ˈtä-jə-nē 
: the development or course of development especially of an individual organism
Example Sentences
Recent Examples on the Web Having a big nose: structure, ontogeny, and function of the elephant seal proboscis. 
Darren Naish, Scientific American Blog Network, 3 June 2017
Darren Naish, Scientific American Blog Network, 3 June 2017 Word History
Etymology
International Scientific Vocabulary
First Known Use
1872, in the meaning defined above
Medical Definition
ontogeny
noun
on·tog·e·ny än-ˈtäj-ə-nē
plural ontogenies
: the development or course of development of an individual organism
called also ontogenesis
compare phylogeny sense 2