steroid hormone steroid hormone 2012-10-15T04:36:54Z A condition in which the main influencing factor is a chemical substance the structure of which is based on the basic 17-carbon-atom ring system steroid nucleus but may or may not have the characteristic arrangement of four fused cycloalkane rings, and which is produced in its endogenous state by an organ, cells of an organ or scattered cells, having a specific regulatory affect on the activity of an organ or tissue. CHEBI:26764 XCO:0000229 experimental_condition_ontology jsmith