metabolic disorder

NOUN
18 LETTERS · STARTS WITH M

metabolic disorder is a valid 18-letter word worth 25 points in Scrabble and 29 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
M3E1T1A1B3O1L1I1C3D2I1S1O1R1D2E1R1
3 + 1 + 1 + 1 + 3 + 1 + 1 + 1 + 3 + 0 + 2 + 1 + 1 + 1 + 1 + 2 + 1 + 1 =25 PTS
DOUBLE WORD → 50TRIPLE WORD → 75
MEANING

What does metabolic disorder mean?