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.
From the Latin prefix com- (with, together, jointly) + the Latin adjective mensalis (of the table). Commensal people eat together at the same table.
Last Editorial Review: 5/13/2016
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