spectral series

15 LETTERS · STARTS WITH S

spectral series is a valid 15-letter word worth 18 points in Scrabble and 21 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

S1P3E1C3T1R1A1L1S1E1R1I1E1S1

1 + 3 + 1 + 3 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 1 + 1 + 1 + 1 =18 PTS

DOUBLE WORD → 36TRIPLE WORD → 54

MEANING

What does spectral series mean?