fine structure

NOUN /fin_'strəkʧər/
14 LETTERS · 2 SYLLABLES · STARTS WITH F

fine structure is a valid 14-letter word worth 18 points in Scrabble and 22 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
F4I1N1E1S1T1R1U1C3T1U1R1E1
4 + 1 + 1 + 1 + 0 + 1 + 1 + 1 + 1 + 3 + 1 + 1 + 1 + 1 =18 PTS
DOUBLE WORD → 36TRIPLE WORD → 54
MEANING

What does fine structure mean?

NOUN · 1 SENSE
1

The presence of groups of closely spaced spectrum lines observed in the atomic spectrum of certain elements.

“the fine structure results from slightly different energy levels”