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Commensalism benefits one organism and the other organism is neither benefited nor harmed. It occurs when one organism takes benefits by interacting with another organism by which the host organism is not affected. A good example is a remora living with a shark. Remoras eat leftover food from the shark.
Medical Definition of Commensal Commensal: 1. Living in a relationship in which one organism derives food or other benefits from another organism without hurting or helping it. Commensal bacteria are part of the normal flora in the mouth. 2. An intimate relationship. The Norway rat, roof rat, and house mouse are considered commensal rodents because of their intimate relationships with humans. From the Latin prefix com- (with, together, jointly) + the Latin adjective mensalis (of the table). Commensal people eat together at the same table.