Meaning & use
Os
Last updated
A bone, or a bone-like or mouth-shaped opening in the body, as used in anatomical terminology.
See it in a sentence
The doctor noted that the external os of the cervix was slightly dilated.
The fossil included a well-preserved os from the animal's forelimb.
A note on using this word
"Os" comes directly from Latin, where it can mean either "bone" or "mouth," and it survives today almost exclusively in medical and anatomical vocabulary.
Words with a similar meaning
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