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Medical Definition of Troisier's node
1. Historic term for a lymph node immediately above the clavicle, especially on the left side, that is palpably enlarged as the result of a metastasis from a malignant neoplasm; the presence of such a node indicates that the probable site of primary involvement is in an abdominal organ. See: signal node. Synonym: Troisier's node. (05 Mar 2000)