biocenosis
noun
bio·ce·no·sis ˌbī-ō-sə-ˈnō-səs 
variants or biocoenosis
plural biocenoses
ˌbī-ō-sə-ˈnō-ˌsēz
: an ecological community especially when forming a self-regulating unit
Word History
Etymology
New Latin, from bi- entry 2 + Greek koinōsis sharing, from koinoun to make common, from koinos common
First Known Use
1883, in the meaning defined above