1. plural of isthmus; narrow strips of land connecting two larger land areas
Usage: anatomy; geography

Examples

• The isthmi connecting the peninsulas were vulnerable to erosion.
• Several isthmi in the region serve as important trade routes.
• The anatomist studied the isthmi of the brain stem.
• Ancient civilizations often built fortifications across strategic isthmi.
• The map clearly showed the narrow isthmi between the islands.