hydrated oxide

NOUN
14 LETTERS · STARTS WITH H

hydrated oxide is a valid 14-letter word worth 29 points in Scrabble and 27 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
H4Y4D2R1A1T1E1D2O1X8I1D2E1
4 + 4 + 2 + 1 + 1 + 1 + 1 + 2 + 0 + 1 + 8 + 1 + 2 + 1 =29 PTS
DOUBLE WORD → 58TRIPLE WORD → 87
MEANING

What does hydrated oxide mean?