inherited disease

NOUN
17 LETTERS · STARTS WITH I

inherited disease is a valid 17-letter word worth 21 points in Scrabble and 21 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
I1N1H4E1R1I1T1E1D2D2I1S1E1A1S1E1
1 + 1 + 4 + 1 + 1 + 1 + 1 + 1 + 2 + 0 + 2 + 1 + 1 + 1 + 1 + 1 + 1 =21 PTS
DOUBLE WORD → 42TRIPLE WORD → 63
MEANING

What does inherited disease mean?