spectraspectral absorptivityspectral bandspectral band widthspectral linespectrogramspectrographspectrographyspectrologyspectrometerspectrophotometerspectrophotometryspectroqualityspectroscopespectroscopistspectroscopyspectrumspectrum linespeedspheresphericalspherical topspherulitespinspin angular momentumspin couplingspin decouplingspin dyeingspin lattice intractionspin orbit couplingspin pairedspin paired complexspin spin couplingspin statespinneretspinneretespinning band columnspinning chargespiral agitatorspirit lampspirit thermometerspiro compoundssplash headsplittingspongespontaneityspontaneousspontaneous emissionspontaneous ignitionspray