noun (plural symbioses ˌsɪmbɪˈəʊsiːzˌsɪmbʌɪˈəʊsiːz)
[mass noun] Biology
1. Interaction between two different organisms living in close physical association, typically to the advantage of both.
Symbioses are common. We are in a symbiotic relationship with all the bacteria in our guts, for example. My favorite symbiotic relationship is between a bacterium known as Wolbachia, and a very small wasp known as Trichogramma.
In the laboratory, we can watch all this happen.