Symbiosis

Symbiosis (pl. symbioses)(from the Greek words syn = with/plus and bio = life) is an interaction between two organisms when at least one benefits. The term host is usually used for the larger (macro) of the two members of a symbiosis. The smaller (micro) member is called the symbiont (plural: symbionts), or alternately, symbiote (plural: symbiotes). When a microscopic symbiont lives inside the cells of a host, it is referred to as an endosymbiont.