Symbiosis

sim-bi-ō′sis, n. a term introduced by De Bary to denote certain kinds of physiological partnership between organisms of different kinds—best restricted to such intimate and complementary partnerships as exist between algoid and fungoid elements in lichens, or between unicellular Algæ; and Radiolarians.— n. Sym′bion , an organism living in such a state.— adj. Symbiot′ic .— adv. Symbiot′ically . [Gr. syn , together, bios , life.]