cartilaginous structure

NOUN
23 LETTERS · STARTS WITH C

cartilaginous structure is a valid 23-letter word worth 27 points in Scrabble and 35 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
C3A1R1T1I1L1A1G2I1N1O1U1S1S1T1R1U1C3T1U1R1E1
3 + 1 + 1 + 1 + 1 + 1 + 1 + 2 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 1 + 1 + 3 + 1 + 1 + 1 + 1 =27 PTS
DOUBLE WORD → 54TRIPLE WORD → 81
MEANING

What does cartilaginous structure mean?