cumulus

NOUN /kjumjələs/
7 LETTERS · 3 SYLLABLES · STARTS WITH C

cumulus is a valid 7-letter word worth 11 points in Scrabble and 17 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
C3U1M3U1L1U1S1
3 + 1 + 3 + 1 + 1 + 1 + 1 =11 PTS
DOUBLE WORD → 22TRIPLE WORD → 33
MEANING

What does cumulus mean?