biology definition of organic
organic. adj. 1. (Biology) of, relating to, derived from, or characteristic of living plants and animals. 2. (Biology) of or relating to animal or plant constituents or products having a carbon basis. 3. (Biology) of or relating to one or more organs of an animal or plant. 4. (Chemistry) of, relating to, or belonging to the class of chemical compounds that are formed from carbon Compare inorganic 2: an organic compound.