chain closure

13 LETTERS · STARTS WITH C

chain closure is a valid 13-letter word worth 19 points in Scrabble and 23 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

C3H4A1I1N1C3L1O1S1U1R1E1

3 + 4 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 1 + 1 + 1 =19 PTS

DOUBLE WORD → 38TRIPLE WORD → 57

MEANING

What does chain closure mean?