spec·tro·pho·tom·e·ter 
(spĕk′trō-fō-tŏmĭ-tər)
(spĕk′trō-fō-tŏmĭ-tər)n.
An instrument used to determine the relative intensity of various wavelengths in a spectrum of light.
spec′tro·pho′to·metric (-fō′tə-mĕtrĭk) adj.
spec′tro·pho·tome·try n.
- burningly
- burnish
- burnisher
- burn itself out
- burn (one's) bridges
- burn one's bridges
- burn one's candle at both ends
- burnoose
- burnous
- burn out
- burnout
- Burns
- Burns
- Burnsian
- Burnside
- burnsides
- burnt
- burn the candle at both ends
- burn the midnight oil
- burn the/one's candle at both ends
- burnt offering
- burnt-out
- burnt-out
- burnt sienna
- burn up