- The relationships of groups of organisms as reflected by their genetic makeup.
Definition from: MeSH via Unified Medical Language System at the National Library of Medicine
- 1 : the evolutionary history of a kind of organism.
2 : the evolution of a genetically related group of organisms as distinguished from the development of the individual organism -- called also phylogenesis.
Definition from: Merriam-Webster's Medical Dictionary by Merriam-Webster Inc.
See also Understanding Medical Terminology.