undercurrent relay

18 LETTERS · STARTS WITH U

undercurrent relay is a valid 18-letter word worth 23 points in Scrabble and 28 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

U1N1D2E1R1C3U1R1R1E1N1T1R1E1L1A1Y4

1 + 1 + 2 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 1 + 1 + 4 =23 PTS

DOUBLE WORD → 46TRIPLE WORD → 69

MEANING

What does undercurrent relay mean?