Symbiose                                 Symbiosis

SYMBIOSE. Wortart: Substantiv, feminin. Gebrauch: Biologie. Zusammenleben zweier Lebewesen verschiedener Arten zu beidseitigem Vorteil. Duden

SYMBIOSIS. noun (plural symbioses) Biology: Interaction between two different organisms living in close physical association, typically to the advantage of both. Oxford Advanced Learner's Dictionary