fuming sulphuric acid

21 LETTERS · STARTS WITH F

fuming sulphuric acid is a valid 21-letter word worth 35 points in Scrabble and 44 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

F4U1M3I1N1G2S1U1L1P3H4U1R1I1C3A1C3I1D2

4 + 1 + 3 + 1 + 1 + 2 + 0 + 1 + 1 + 1 + 3 + 4 + 1 + 1 + 1 + 3 + 0 + 1 + 3 + 1 + 2 =35 PTS

DOUBLE WORD → 70TRIPLE WORD → 105

MEANING

What does fuming sulphuric acid mean?