Is “Isthmi” a Scrabble word?
Yes
ISTHMI
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Isthmi
noun
1.A narrow strip of land, bordered on both sides by water, and connecting two larger landmasses.
2.Any such narrow part connecting two larger structures.
3.An edge in a graph whose deletion increases the number of connected components of the graph.