There are 4 main definitions of os in English:

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os 1

Pronunciation: /äs/

noun (plural ossa /ˈäsə/)

Anatomy
A bone (used chiefly in Latin names of individual bones, e.g., os trapezium).
Example sentences
  • In this group, the cortex of the os sacrum was destroyed and had a spongelike rather than compact appearance.
  • Besides this unambiguous distinguishing character, a second, derived character, exists which is particular to the Carnivora: in the wrist the joint bones, scaphoid, lunate, and os centrale, are fused.

Origin

Latin.

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There are 4 main definitions of os in English:

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os 2

Pronunciation: /äs/

noun (plural ora /ˈōrə/)

Anatomy
An opening or entrance to a passage, especially one at either end of the cervix of the uterus.
Example sentences
  • The distance between the internal and external os was measured both as a straight line and also as a curved line along the endocervical canal.
  • The internal os closes by 3 days, the external os by 3 weeks.

Origin

Mid 18th century: from Latin os 'mouth'.

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There are 4 main definitions of os in English:

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Os 3

symbol

The chemical element osmium.
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There are 4 main definitions of os in English:

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OS 4

abbreviation

1(In calculating dates) Old Style.
2 Computing Operating system.
3Ordinary Seaman.
4(In the UK) Ordnance Survey.
5(As a size of clothing) outsize.
6Out of stock.
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