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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 classic literature ?
"That is evident," I replied; "and for the sake of archaeologists let us hope that these excavations will be made sooner or later, when new towns are established on the isthmus, after the construction of the Suez Canal; a canal, however, very useless to a vessel like the Nautilus."
"Well, unless the Nautilus sails on dry land, and passes above the isthmus "
"But this isthmus is composed of nothing but quick sands?"
Located on the Isthmus of Panama, the narrow bridge of land connects North and South America.
HSK usually consists of two renal masses fused at their lower poles by a parenchymal or fibrous isthmus (Natsis et al., 2014).
Overall, in the current article the terms "Uskela Ware" and "Late Comb Ware" are not totally synonymous, at least for the Karelian Isthmus region.
It is situated in the pretracheal region between the isthmus and the hyoid bone.
Patients with AFl are better treated with catheter-based ablation to create a complete line of conduction block across the cavotricuspid isthmus. Ablation effectively prevents the recurrence of AFl.
Those privileged enough to have traveled on the waterway, as your correspondent recently did, would notice the locks - including the iconic Miraflores and Pedro Miguel locks - serve as water lifts to raise or lower ships from the Pacific or Atlantic Oceans, depending on their North or Southbound routes, either side of the Isthmus of Panama, to the artificial Gatun Lake 27 meters above sea level; the Canal's connecting water body for transit.
The thyroid gland is an endocrine gland composed of two lobes connected by the isthmus tissue (1).
Because of the presence of a substantially thick isthmus, the kidney masses were not divided and the recipient received both fused kidney portions en bloc.