declinometer
dec·li·no·meter
noun
1.
an instrument for measuring magnetic declination
Origin
From decline + -o- + -meter.
Related words
Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.