O.S.

1

or o.s.

(in prescriptions) the left eye.

Origin of O.S.

1
From the Latin word oculus sinister

Definition for o.s. (2 of 2)

O.S. 2

Old Saxon.
Old School.
Old series.
(of the calendar) Old Style.
Also o.s. ordinary seaman.

British Dictionary definitions for o.s.

o.s.

OS or O/S

abbreviation for

out of stock
banking outstanding