filamentary transistor

22 LETTERS · STARTS WITH F

filamentary transistor is a valid 22-letter word worth 29 points in Scrabble and 32 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

F4I1L1A1M3E1N1T1A1R1Y4T1R1A1N1S1I1S1T1O1R1

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

DOUBLE WORD → 58TRIPLE WORD → 87

MEANING

What does filamentary transistor mean?