fairy lantern

NOUN
13 LETTERS · STARTS WITH F

fairy lantern is a valid 13-letter word worth 18 points in Scrabble and 20 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
F4A1I1R1Y4L1A1N1T1E1R1N1
4 + 1 + 1 + 1 + 4 + 0 + 1 + 1 + 1 + 1 + 1 + 1 + 1 =18 PTS
DOUBLE WORD → 36TRIPLE WORD → 54
MEANING

What does fairy lantern mean?