spectral type

13 LETTERS · STARTS WITH S

spectral type is a valid 13-letter word worth 21 points in Scrabble and 24 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

S1P3E1C3T1R1A1L1T1Y4P3E1

1 + 3 + 1 + 3 + 1 + 1 + 1 + 1 + 0 + 1 + 4 + 3 + 1 =21 PTS

DOUBLE WORD → 42TRIPLE WORD → 63

MEANING

What does spectral type mean?