speech defect

NOUN
13 LETTERS · STARTS WITH S

speech defect is a valid 13-letter word worth 25 points in Scrabble and 27 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
S1P3E1E1C3H4D2E1F4E1C3T1
1 + 3 + 1 + 1 + 3 + 4 + 0 + 2 + 1 + 4 + 1 + 3 + 1 =25 PTS
DOUBLE WORD → 50TRIPLE WORD → 75
MEANING

What does speech defect mean?