a. A hat of cloth or straw, often held in place by ribbons tied under the chin and traditionally worn by women and children.
b. Scots A brimless cap traditionally worn by men or boys.
2. A removable metal plate over a machine part, such as a valve.
3. Chiefly British The hood of an automobile.
a. A windscreen for a chimney.
b. A cover for a fireplace.
5. Nautical A strip of canvas laced to a fore-and-aft sail to increase sail area.
tr.v. bon·net·ed, bon·net·ing, bon·nets
To put a bonnet on.
[Middle English bonet, cap, from Old French, material for a headdress, perhaps from Medieval Latin obbonis, probably of Germanic origin.]
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.