Science, Tech, Math › Science Desiccant Definition Chemistry Glossary Definition of Desiccant Share Flipboard Email Print Pixabay Science Chemistry Chemical Laws Basics Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate by Anne Marie Helmenstine, Ph.D. Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. Updated July 03, 2019 Desiccant Definition: A desiccant is a drying agent. A chemical species which picks up water molecules. Alternate Spelling: Dessicant Return to the Chemistry Glossary Index Continue Reading