English
gruntometer
From grunt + -o- + -meter.
Formed from grunt + -o- + -meter
Proto-Indo-European *gʰrun- ‘to shout’
…
Proto-Germanic *grunnatjaną ‘to grunt’
Proto-West Germanic *grunnattjan ‘to grunt’
Old English grunnettan ‘to grunt’
Middle English grunten ‘to grunt or groan as or like an animal’
English grunt
Today it means
noun A (non-scientific) device for measuring the volume of a tennis player's grunts of exertion.
Language periods are conventional ranges, not dates for this word.
Etymograph / gruntometer