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ISTHMUS. A tongue or strip of land between two seas. Glos. on Law, 37, book 2, tit. 3, of the Dig.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
New atrial arrhythmias occur in a significant proportion of patients who undergo cavotricuspid isthmus ablation for typical AFl.
Adding roof, cavotricuspid isthmus, or mitral isthmus ablation lines in the atria might develop more ATs.