process milling

15 LETTERS · STARTS WITH P

process milling is a valid 15-letter word worth 21 points in Scrabble and 28 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

P3R1O1C3E1S1S1M3I1L1L1I1N1G2

3 + 1 + 1 + 3 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 1 + 1 + 2 =21 PTS

DOUBLE WORD → 42TRIPLE WORD → 63

MEANING

What does process milling mean?