Humectant
ahd-5
noun.
A substance that promotes retention of moisture.
adjective.
Promoting retention of moisture.
The Century Dictionary and Cyclopedia
Moistening; diluent.
noun.
A substance regarded as tending to increase the fluidity of the blood.
the GNU version of the Collaborative International Dictionary of English
adjective.
Diluent.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
any substance that promotes the
retention
of
water
, especially one used to keep a
food
product
moist
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
any substance that is added to another substance to keep it moist