Is “Isopach” a Scrabble word?
Yes
ISOPACH
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 Isopach
noun
1.A line on a chart joining parts of a stratigraphic unit that have the same thickness; an isopachous line.