subtractive process

19 LETTERS · STARTS WITH S

subtractive process is a valid 19-letter word worth 29 points in Scrabble and 35 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

S1U1B3T1R1A1C3T1I1V4E1P3R1O1C3E1S1S1

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

DOUBLE WORD → 58TRIPLE WORD → 87

MEANING

What does subtractive process mean?