ad·sorp·tion (ăd-zôrpshən, -sôrp-)
The accumulation of gases, liquids, or solutes on the surface of a solid or liquid.
(click for a larger image)adsorption
Toxic gas molecules adhere to the activated charcoal in a gas mask, allowing the person wearing the mask to breathe nontoxicr.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.