gra·di·om·e·ter noun \ˌgrā-dē-ˈä-mə-tər\
: an instrument for measuring the gradient of a physical quantity (as the earth's magnetic field)
Origin of GRADIOMETER
ent + -o-
First Known Use: 1899
Seen & Heard
What made you want to look up gradiometer? Please tell us where you read or heard it (including the quote, if possible).