isthmuses

/IH1 S M AH0 S IH0 Z/
noun
  1. 1

    A narrow strip of land, bordered on both sides by water, and connecting two larger landmasses.

  2. 2

    Any such narrow part connecting two larger structures.

  3. 3

    An edge in a graph whose deletion increases the number of connected components of the graph.

Source: https://en.wiktionary.org/wiki/isthmus, https://en.wiktionary.org/wiki/isthmuses