| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
| |
| o |
| |
| PRONUNCIATION: |   |
| VARIANT FORMS: | or O |
| NOUN: | Inflected forms: pl. o's or O's also os or Os
1. The 15th letter of the modern English alphabet. 2. Any of the speech sounds represented by the letter o. 3. The 15th in a series. 4. Something shaped like the letter O. 5. O One of the four major blood groups in the ABO system. Individuals with this blood group have neither A nor B antigens on the surface of their red blood cells, and have both anti-A and anti-B antibodies in their blood serum. 6. A zero.
| | |
| |
| 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. |
|
|
