English
laughometer
From laugh + -o- + -meter.
Formed from laugh + -o- + -meter
Proto-Indo-European *klek- ‘to laugh, cackle’
Proto-Germanic *hlahjaną ‘to laugh’
Proto-West Germanic *hlahhjan ‘to laugh’
Old English hliehhan ‘to laugh’
Middle English laughen
English laugh
Today it means
noun A (non-scientific) device for measuring laughter.
Language periods are conventional ranges, not dates for this word.
Etymograph / laughometer