corroboratory

ADJECTIVE
13 LETTERS · STARTS WITH C

corroboratory is a valid 13-letter word worth 20 points in Scrabble and 21 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
C3O1R1R1O1B3O1R1A1T1O1R1Y4
3 + 1 + 1 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 4 =20 PTS
DOUBLE WORD → 40TRIPLE WORD → 60
MEANING

What does corroboratory mean?