os

¹

[os]

noun

plural

ossa 

1. Anatomy, Zoology.,  a bone.

O.S.

²

Or o.s.

abbreviation

1. (in prescriptions) the left eye.

os

³

[os]

noun

plural

ora 

1. Anatomy, Zoology.,  a mouth or orifice of the body.

O.S.

⁴

abbreviation

1. Old Saxon. Also OS

2. (of the calendar) Old Style.

3. ordinary seaman. Also o.s.

os

⁵

[ohs]

noun

plural

osar 

1. Geology.,  an esker, especially when of great length.

Os

⁶

1. Symbol, Chemistry.,  osmium.

OS

⁷

abbreviation

1. Old Saxon. Also O.S.

2. Computers.,  operating system.

o/s

⁸

1. (of the calendar) Old Style.

2. out of stock.

3. (in banking) outstanding.

O/S

⁹

1. (of the calendar) Old Style.

OS

¹

abbreviation

1. Old School

2. Old Style (method of reckoning dates)

3. Ordinary Seaman

4. (in Britain) Ordnance Survey

5. outsize

6. Old Saxon (language)

o.s.

²

abbreviation

1. out of stock

2. banking outstanding

Os

³

symbol

1. osmium

os

⁴

/ ɒs /

noun

1. anatomy the technical name for bone

os

⁵

/ ɒs /

noun

1. anatomy zoology a mouth or mouthlike part or opening

os

⁶

/ əʊs /

noun

1. another name for esker

Word History and Origins

Origin of os¹

First recorded in 1540–50; from Latin os (inflectional stem oss- ) “bone”

Origin of os²

From Latin oculus sinister

Origin of os³

First recorded in 1730–40; from Latin ōs (inflectional stem ōr- ) “mouth”

Origin of os⁴

First recorded in 1840–50 as osar (plural); from Swedish ås (plural åsar ) “ridge (of a hill),” from Old Norse áss “thick pole or main beam; rocky ridge”

Word History and Origins

Origin of os¹

C16: from Latin: bone; compare Greek osteon

Origin of os²

C18: from Latin

Origin of os³

C19 osar (pl), from Swedish ås (sing) ridge