tunnel effect

13 LETTERS · STARTS WITH T

tunnel effect is a valid 13-letter word worth 20 points in Scrabble and 25 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

T1U1N1N1E1L1E1F4F4E1C3T1

1 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 4 + 4 + 1 + 3 + 1 =20 PTS

DOUBLE WORD → 40TRIPLE WORD → 60

MEANING

What does tunnel effect mean?