proximity fuse

14 LETTERS · STARTS WITH P

proximity fuse is a valid 14-letter word worth 30 points in Scrabble and 32 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

P3R1O1X8I1M3I1T1Y4F4U1S1E1

3 + 1 + 1 + 8 + 1 + 3 + 1 + 1 + 4 + 0 + 4 + 1 + 1 + 1 =30 PTS

DOUBLE WORD → 60TRIPLE WORD → 90

MEANING

What does proximity fuse mean?