| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
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| birr1 |
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| PRONUNCIATION: |  bûr |
| NOUN: | 1. A whirring sound. 2. Strong forward momentum; driving force. | | INTRANSITIVE VERB: | Inflected forms: birred, birr·ing, birrs
To make a whirring sound. | | ETYMOLOGY: | Middle English bir, favorable wind, from Old Norse byrr. See bher-1 in Appendix I.
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| The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved. |
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