Anhydrous
Imagine trying to dry out a soaked sponge until it's completely free of moisture. This process is similar to creating an anhydrous substance, where all water is meticulously removed. Just like wringing out a sponge to ensure no water is left, making a substance anhydrous involves removing every last drop of water, leaving it completely dry and moisture-free.
Practice Version
Anhydrous: A substance from which all water has been removed. Anhydrous. In simple terms, "anhydrous" means a material that does not contain any water.