optical isomerism

17 LETTERS · STARTS WITH O

optical isomerism is a valid 17-letter word worth 24 points in Scrabble and 29 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

O1P3T1I1C3A1L1I1S1O1M3E1R1I1S1M3

1 + 3 + 1 + 1 + 3 + 1 + 1 + 0 + 1 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 3 =24 PTS

DOUBLE WORD → 48TRIPLE WORD → 72

MEANING

What does optical isomerism mean?