English
spectrobolometer
From spectro- + bolometer.
Formed from spectro- + bolometer
Proto-Indo-European *speḱ- ‘to see, to look, to observe’
…
Proto-Italic *spekjō ‘to observe, see’
Latin speciō ‘to observe, watch, look at’
Latin spectrum ‘apparition, specter, phantom’
English spectrum
English spectro-
Proto-Indo-European *gʷelH- ‘to throw, reach, pierce’
Proto-Hellenic *gʷəlnō
Ancient Greek βᾰ́λλω ‘to throw, cast, hurl’
Ancient Greek βολή ‘a throw, the stroke’
Ancient Greek μέτρον ‘something used to measure: measure, rule, weight’
English bolometer
Today it means
noun A combined spectroscope and bolometer for determining the distribution of energy in a spectrum.
Language periods are conventional ranges, not dates for this word.
Etymograph / spectrobolometer