thermonuclear fusion

20 LETTERS · STARTS WITH T

thermonuclear fusion is a valid 20-letter word worth 29 points in Scrabble and 35 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

T1H4E1R1M3O1N1U1C3L1E1A1R1F4U1S1I1O1N1

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

DOUBLE WORD → 58TRIPLE WORD → 87

MEANING

What does thermonuclear fusion mean?