zone refining

13 LETTERS · STARTS WITH Z

zone refining is a valid 13-letter word worth 25 points in Scrabble and 29 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
Z10O1N1E1R1E1F4I1N1I1N1G2
10 + 1 + 1 + 1 + 0 + 1 + 1 + 4 + 1 + 1 + 1 + 1 + 2 =25 PTS
DOUBLE WORD → 50TRIPLE WORD → 75
MEANING

What does zone refining mean?

1