coat-of-mail shell

NOUN
18 LETTERS · STARTS WITH C

coat-of-mail shell is a valid 18-letter word worth 25 points in Scrabble and 29 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
C3O1A1T1-0O1F4-0M3A1I1L1S1H4E1L1L1
3 + 1 + 1 + 1 + 0 + 1 + 4 + 0 + 3 + 1 + 1 + 1 + 0 + 1 + 4 + 1 + 1 + 1 =25 PTS
DOUBLE WORD → 50TRIPLE WORD → 75
MEANING

What does coat-of-mail shell mean?

NOUN · 1 SENSE
1

Primitive elongated bilaterally symmetrical marine mollusk having a mantle covered with eight calcareous plates.