defensive structure

NOUN
19 LETTERS · STARTS WITH D

defensive structure is a valid 19-letter word worth 27 points in Scrabble and 32 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
D2E1F4E1N1S1I1V4E1S1T1R1U1C3T1U1R1E1
2 + 1 + 4 + 1 + 1 + 1 + 1 + 4 + 1 + 0 + 1 + 1 + 1 + 1 + 3 + 1 + 1 + 1 + 1 =27 PTS
DOUBLE WORD → 54TRIPLE WORD → 81
MEANING

What does defensive structure mean?

NOUN · 1 SENSE