vertical amplifier

18 LETTERS · STARTS WITH V

vertical amplifier is a valid 18-letter word worth 29 points in Scrabble and 35 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

V4E1R1T1I1C3A1L1A1M3P3L1I1F4I1E1R1

4 + 1 + 1 + 1 + 1 + 3 + 1 + 1 + 0 + 1 + 3 + 3 + 1 + 1 + 4 + 1 + 1 + 1 =29 PTS

DOUBLE WORD → 58TRIPLE WORD → 87

MEANING

What does vertical amplifier mean?