optical activity

16 LETTERS · STARTS WITH O

optical activity is a valid 16-letter word worth 27 points in Scrabble and 31 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

O1P3T1I1C3A1L1A1C3T1I1V4I1T1Y4

1 + 3 + 1 + 1 + 3 + 1 + 1 + 0 + 1 + 3 + 1 + 1 + 4 + 1 + 1 + 4 =27 PTS

DOUBLE WORD → 54TRIPLE WORD → 81

MEANING

What does optical activity mean?