memory loss

NOUN
11 LETTERS · STARTS WITH M

memory loss is a valid 11-letter word worth 17 points in Scrabble and 19 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
M3E1M3O1R1Y4L1O1S1S1
3 + 1 + 3 + 1 + 1 + 4 + 0 + 1 + 1 + 1 + 1 =17 PTS
DOUBLE WORD → 34TRIPLE WORD → 51
MEANING

What does memory loss mean?