os

1 of 4

abbreviation

[Latin oculus sinister] left eye

Old Style

operating system

out of stock

Examples of os in a Sentence

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Noun

While the vast majority of Trump voters are still non-Latino whites, the jump in his support among Latina/os and Asian Americans has drawn significant attention and prompted hand-wringing among Democrats. —

Jane Hong / Made By History, TIME, 24 Jan. 2025

Word History

Etymology

Noun (1)

Latin oss-, os — more at osseous

Noun (2)

Latin or-, os — more at oral

First Known Use

Noun (1)

15th century, in the meaning defined above

Noun (2)

1737, in the meaning defined above

Time Traveler

The first known use of os was in the 15th century

See more words from the same century

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Style

“Os.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/os. Accessed 3 Feb. 2025.

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Medical Definition

1 of 4 noun

ˈäs

plural ossa ˈäs-ə

: bone see os calcis, os coxae

2 of 4 noun

ˈōs

plural ora ˈōr-ə, ˈȯr-ə

: orifice see external os, internal os, per os

3 of 4 symbol

osmium

4 of 4 abbreviation

left eye

—used in writing prescriptions

Etymology

Abbreviation

Latin oculus sinister

Last Updated: 2 Feb 2025 - Updated example sentences

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os

noun (1)

noun (2)

symbol

abbreviation

Examples of os in a Sentence

Word History

Dictionary Entries Near os

Cite this Entry

Medical Definition