inborn reflex

NOUN
13 LETTERS · STARTS WITH I

inborn reflex is a valid 13-letter word worth 24 points in Scrabble and 28 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
I1N1B3O1R1N1R1E1F4L1E1X8
1 + 1 + 3 + 1 + 1 + 1 + 0 + 1 + 1 + 4 + 1 + 1 + 8 =24 PTS
DOUBLE WORD → 48TRIPLE WORD → 72
MEANING

What does inborn reflex mean?