1. A device that circulates fresh air and expels stale or foul air.
2. Medicine A machine that supplies oxygen or a mixture of oxygen and air, used in artificial respiration to control or assist breathing. Also called respirator.
venti·la·to′ry (vĕntl-ə-tôr′ē) adj.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. 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.