Biotypic refers to a category of living organisms that share similar physical characteristics. Synonyms for biotypic include biogroup, biotype, eco-type, and strain. These terms can be used interchangeably to denote a population of organisms that has unique genetic and physiological traits. A biogroup can be defined as a group of cultivars that share similar genetic characteristics, whereas an eco-type refers to a subpopulation of species that have adapted to a particular habitat. Strain, on the other hand, is often used to describe a genetically modified organism that has been altered in some way. In general, these synonyms are useful for scientists and researchers who are studying different groups of organisms.