There are 4 main definitions of os in English:

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os1

Syllabification: os

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.

Definition of os in:

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There are 4 main definitions of os in English:

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os2

Syllabification: os

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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OS4

Syllabification: OS

abbreviation

1.1 Computing Operating system.
1.2Ordinary Seaman.
1.3(In the UK) Ordnance Survey.
1.4(As a size of clothing) outsize.
1.5Out of stock.

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