A substance that produces immunological tolerance. ... (05 Mar 2000) ... 
(tol´әr-o-jәn) an antigen used to introduce tolerance, particularly a form of an antigen (usually a soluble form) that induces tolerance, as distinguished from an immunogen, another form (usually an insoluble form) that induces immunity.
Type: Term Pronunciation: tol′ĕr-ō-jen Definitions: 1. A substance that produces immunologic tolerance.