optical phenomenon

NOUN
18 LETTERS · STARTS WITH O

optical phenomenon is a valid 18-letter word worth 28 points in Scrabble and 35 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
O1P3T1I1C3A1L1P3H4E1N1O1M3E1N1O1N1
1 + 3 + 1 + 1 + 3 + 1 + 1 + 0 + 3 + 4 + 1 + 1 + 1 + 3 + 1 + 1 + 1 + 1 =28 PTS
DOUBLE WORD → 56TRIPLE WORD → 84
MEANING

What does optical phenomenon mean?

NOUN · 1 SENSE