noun
Usage: usually capitalized E
: a unit for expressing horizontal gradients of gravity (as in geophysical prospecting) equal to 10 -9 gal per horizontal centimeter
noun
Usage: usually capitalized E
: a unit for expressing horizontal gradients of gravity (as in geophysical prospecting) equal to 10 -9 gal per horizontal centimeter
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012