English
spectrogoniometer
From spectro- + goniometer.
A compound of spectrum + spectro- + gonio- + -meter + goniometer
Proto-Indo-European *speḱ- ‘to see, to look, to observe’
Proto-Indo-European *spéḱyeti ‘to be looking at, to keep looking at’
Proto-Italic *spekjō ‘to observe, see’
Latin speciō ‘to observe, watch, look at’
Latin spectrum ‘appearance, image’
English spectrum
Proto-Indo-European *speḱ- ‘to see, to look, to observe’
Proto-Indo-European *spéḱyeti ‘to be looking at, to keep looking at’
Proto-Italic *spekjō ‘to observe, see’
Latin speciō ‘to observe, watch, look at’
Latin spectrum ‘appearance, image’
English spectrum
English spectro-
Proto-Indo-European *ǵónu ‘knee’
Proto-Hellenic *gónu ‘knee’
Proto-Hellenic *gonwía
Ancient Greek γωνίᾱ
Ancient Greek μέτρον ‘something used to measure: measure, rule, weight’
English goniometer
Today it means
noun A device that measures angles of refraction at a range of wavelengths.
Language periods are conventional ranges, not dates for this word.
Etymograph / spectrogoniometer