cluster variable

16 LETTERS · STARTS WITH C

cluster variable is a valid 16-letter word worth 22 points in Scrabble and 28 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

C3L1U1S1T1E1R1V4A1R1I1A1B3L1E1

3 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 4 + 1 + 1 + 1 + 1 + 3 + 1 + 1 =22 PTS

DOUBLE WORD → 44TRIPLE WORD → 66

MEANING

What does cluster variable mean?