suit of armour

NOUN
14 LETTERS · STARTS WITH S

suit of armour is a valid 14-letter word worth 17 points in Scrabble and 20 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
S1U1I1T1O1F4A1R1M3O1U1R1
1 + 1 + 1 + 1 + 0 + 1 + 4 + 0 + 1 + 1 + 3 + 1 + 1 + 1 =17 PTS
DOUBLE WORD → 34TRIPLE WORD → 51
MEANING

What does suit of armour mean?