drying agent drying agent /ˈdraɪɪŋ ˈeɪdʒənt/

noun

1. () A substance that promotes drying (e.g., calcium oxide absorbs water and is used to remove moisture)  ( desiccant , drier , siccative , drying agent )
   a substance that promotes drying (e.g., calcium oxide absorbs water and is used to remove moisture)