birth defect

NOUN
12 LETTERS · STARTS WITH B

birth defect is a valid 12-letter word worth 22 points in Scrabble and 23 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
B3I1R1T1H4D2E1F4E1C3T1
3 + 1 + 1 + 1 + 4 + 0 + 2 + 1 + 4 + 1 + 3 + 1 =22 PTS
DOUBLE WORD → 44TRIPLE WORD → 66
MEANING

What does birth defect mean?