ora

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o·ra

 (ôr′ə)
n.
Plural of os1.

ora

(ˈɔːrə)
n
(Anatomy) the plural of os2

os1

(ɒs)

n., pl. os•sa (ˈɒs ə)
a bone.
[1540–50; < Latin]

os2

(ɒs)

n., pl. o•ra (ˈɔr ə, ˈoʊr ə)
a mouth or orifice of the body.
[1730–40; < Latin ōs mouth]

OS

1. Old Saxon.
2. Computers. operating system.

Os


Chem. Symbol.
osmium.

O.S.

1. (in prescriptions) the left eye.
[< Latin oculus sinister]
2. old series.
3. ordinary seaman.