n. pl. o·ra (ôrə) A mouth or an opening. |
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
n. pl. os·sa (ŏsə) A bone. [Latin, bone; see ost- 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.
[Swedish ås, ridge, from Old Norse āss.] |
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
OS
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Tweet abbr. 1. or O/S Old Style 2. operating system 3. ordinary seaman |
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
Os
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Tweet The symbol for osmium. |
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.