A long narrow pillow or cushion.
tr.v. bol·stered, bol·ster·ing, bol·sters
1. To support or prop up with or as if with a long narrow pillow or cushion.
2. To buoy up or hearten: Visitors bolstered the patient's morale.
[Middle English, from Old English; see bhelgh- in the Appendix of Indo-European roots.]
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.