dry unit

NOUN
8 LETTERS · STARTS WITH D

dry unit is a valid 8-letter word worth 11 points in Scrabble and 12 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
D2R1Y4U1N1I1T1
2 + 1 + 4 + 0 + 1 + 1 + 1 + 1 =11 PTS
DOUBLE WORD → 22TRIPLE WORD → 33
MEANING

What does dry unit mean?