biotic UK /baɪˈɒt.ɪk/US /baɪˈɑ.tɪk/noun 2adjective 1forms 1 noun2 •A nutritional substance that improves the health of gastrointestinal microorganisms, especially one that occurs naturally.This is done by manipulating the microflora that reside within the GIT of all living things and this is the point at which all the "biotics" come into play. — 2008 •A simple organic organism that is more complex than an organic molecule but simpler than a plant or animal.The biotics constitute an extensive group of organic materials that are simple, living microorganisms and cannot be expressed as chemical formulas. — 1963 adjective1 •Of, pertaining to, or produced by life or living organisms.This study and others at Bolinas Lagoon show that a number of variables, both biotic and abiotic, influence individual, local and regional distribution patterns of Dunlin. — 1994 formsbiotics