- noun a solid which is able to bond with a gas or vapour which touches its surface
- adjective able to adsorb something such as a gas or vapour
- A material that has the ability to extract certain substances from gases, liquids, or solids by causing them to adhere to its surface without changing the physical properties of the adsorbent. Activated carbon, silica gel, and activated alumina are materials frequently used for this application.
- A substance that absorbs another substance.