hearing disorder

NOUN
16 LETTERS · STARTS WITH H

hearing disorder is a valid 16-letter word worth 21 points in Scrabble and 22 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
H4E1A1R1I1N1G2D2I1S1O1R1D2E1R1
4 + 1 + 1 + 1 + 1 + 1 + 2 + 0 + 2 + 1 + 1 + 1 + 1 + 2 + 1 + 1 =21 PTS
DOUBLE WORD → 42TRIPLE WORD → 63
MEANING

What does hearing disorder mean?