1. a device or substance used to add moisture to something

Examples

• She used a sponge moistener to seal the envelopes.
• The office moistener helped prevent paper cuts from dry documents.
• He kept a small moistener on his desk for stamp collecting.
• The moistener made it easier to separate the sticky pages.
• A finger moistener is useful when counting large stacks of bills.
• The postal worker reached for the moistener before sealing packages.