O.S.

1. (in prescriptions) the left eye. [ < L oculus sinister]

2. Old Saxon.

3. Old School.

4. Old series.

5. (of the calendar) Old Style.

6. See ordinary seaman.

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os¹ «os», noun, plural os|sa «OS uh».

Latin. a bone.

os² «os», noun, plural o|ra «AWR uh, OHR-».

Latin. a mouth; opening.

os³ «ohs», noun, plural o|sar.

Geology. an esker.

╂[< Swedish ås ridge (of a hill or roof); åsar, plural]

os-,

prex, the form of ob- (Cf. ↑ob-) in some cases before c and t, as in oscine, ostensible.

o.s. or o/s (no periods),

out of stock.

Os (no periods),

osmium (chemical element).

OS (no periods) or O.S.

Old Saxon.

O.S.,

1. Old Style,

2. ordinary seaman.

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abbr.

■ (in prescriptions) the left eye

Origin:

Latin, oculus sinister