dominical letter

16 LETTERS · STARTS WITH D

dominical letter is a valid 16-letter word worth 20 points in Scrabble and 25 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

D2O1M3I1N1I1C3A1L1L1E1T1T1E1R1

2 + 1 + 3 + 1 + 1 + 1 + 3 + 1 + 1 + 0 + 1 + 1 + 1 + 1 + 1 + 1 =20 PTS

DOUBLE WORD → 40TRIPLE WORD → 60

MEANING

What does dominical letter mean?