desiccant

https://doi.org/10.1351/goldbook.D01618
  1. Drying agent.
  2. In agriculture, a substance used for drying up plants and facilitating their mechanical harvesting.
Source:
PAC, 1993, 65, 2003. 'Glossary for chemists of terms used in toxicology (IUPAC Recommendations 1993)' on page 2037 (https://doi.org/10.1351/pac199365092003)