suit of armor

NOUN
13 LETTERS · STARTS WITH S

suit of armor is a valid 13-letter word worth 16 points in Scrabble and 18 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
S1U1I1T1O1F4A1R1M3O1R1
1 + 1 + 1 + 1 + 0 + 1 + 4 + 0 + 1 + 1 + 3 + 1 + 1 =16 PTS
DOUBLE WORD → 32TRIPLE WORD → 48
MEANING

What does suit of armor mean?