cartesian doubt

15 LETTERS · STARTS WITH C

cartesian doubt is a valid 15-letter word worth 19 points in Scrabble and 23 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

C3A1R1T1E1S1I1A1N1D2O1U1B3T1

3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 2 + 1 + 1 + 3 + 1 =19 PTS

DOUBLE WORD → 38TRIPLE WORD → 57

MEANING

What does cartesian doubt mean?