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os1

Audio Help [os] Pronunciation Key

–noun, plural os·sa

Audio Help [os-uh] Pronunciation Key.

Anatomy, Zoology. a bone.

[Origin: 1540–50; < L

]

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Encyclopædia Britannica, Inc.
os

To learn more about os visit Britannica.com

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os2

Audio Help [os] Pronunciation Key

–noun, plural o·ra

Audio Help [awr-uh, ohr-uh] Pronunciation Key.

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

[Origin: 1730–40; < L ōs mouth

]

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os3

Audio Help [ohs] Pronunciation Key

–noun, plural o·sar

Audio Help [oh-sahr] Pronunciation Key.

Geology. an esker, esp. when of great length.

[Origin: < Sw ås (pl. åsar) ridge

]

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1.	Old Saxon.

2.	Computers. operating system.

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Symbol, Chemistry. osmium.

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O, o

Audio Help [oh] Pronunciation Key

–noun, plural O's or Os; o's or os or oes.

1.	the fifteenth letter of the English alphabet, a vowel.

2.	any spoken sound represented by the letter O or o, as in box, note, short, or love.

3.	something having the shape of an O.

4.	a written or printed representation of the letter O or o.

5.	a device, as a printer's type, for reproducing the letter O or o.

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Audio Help [oh] Pronunciation Key interjection, noun, plural O's.

–interjection

1.	(used before a name in direct address, esp. in solemn or poetic language, to lend earnestness to an appeal): Hear, O Israel!

2.	(used as an expression of surprise, pain, annoyance, longing, gladness, etc.)

–noun

3.	the exclamation “O.”

[Origin: 1125–75; ME < OF < L ō

]

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O.S.

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

2.	Old Saxon.

3.	Old School.

4.	Old series.

5.	(of the calendar) Old Style.

6.	ordinary seaman.

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o.s.

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

2.	ordinary seaman.

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American Heritage Dictionary - Cite This Source - Share This

es·ker Audio Help (ěs'kər) Pronunciation Key
n. A long, narrow ridge of coarse gravel deposited by a stream flowing in or under a decaying glacial ice sheet. Also called os³.

[Irish Gaelic eiscir, from Old Irish escir.]

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

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o or O Audio Help (ō) Pronunciation Key
n. pl. o's or O's also os or Os

The 15th letter of the modern English alphabet.
Any of the speech sounds represented by the letter o.
The 15th in a series.
Something shaped like the letter O.
O One of the four major blood groups in the ABO system. Individuals with this blood group have neither A nor B antigens on the surface of their red blood cells, and have both anti-A and anti-B antibodies in their blood serum.
A zero.

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old style
n.

Printing A style of type originating in the 18th century and characterized by slight contrast between light and heavy strokes and slanting serifs.
Old Style Abbr. OS or O/S The method of reckoning dates according to the Julian calendar.

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ordinary seaman
n. Abbr. OS
A seaman of the lowest grade in the merchant marine.

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os¹ Audio Help (ŏs) Pronunciation Key
n. pl. o·ra (ôr'ə, ōr'ə)
A mouth or an opening.

[Latin ōs, mouth; see ōs- in Indo-European roots.]

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Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

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os² Audio Help (ŏs) Pronunciation Key
n. pl. os·sa (ŏs'ə)
A bone.

[Latin, bone; see ost- in Indo-European roots.]

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Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

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os³ Audio Help (ōs) Pronunciation Key
n. pl. os·ar (ō'sär')
See esker.

[Swedish ås, ridge, from Old Norse āss.]

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Os
The symbol for the element osmium.

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OS
abbr.

or O/S Old Style
ordinary seaman

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os·mi·um Audio Help (ŏz'mē-əm) Pronunciation Key
n. Symbol Os
A bluish-white, hard metallic element, found in small amounts in osmiridium, nickel, and platinum ores. It is used as a platinum hardener and in making pen points, phonograph needles, and instrument pivots. Atomic number 76; atomic weight 190.2; melting point 3,000°C; boiling point 5,000°C; specific gravity 22.57; valence 2, 3, 4, 8. See Table at element.

[From Greek osmē, smell (from the strong odor of osmium tetroxide).]

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WordNet - Cite This Source - Share This

os
noun
1.	a mouth or mouthlike opening
2.	a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known [syn: osmium]
3.	(computer science) software that controls the execution of computer programs and may provide various services [syn: operating system]
4.	the left eye [syn: oculus sinister]
5.	rigid connective tissue that makes up the skeleton of vertebrates [syn: bone]

The American Heritage Science Dictionary - Cite This Source - Share This

O
The symbol for oxygen.

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Os
The symbol for osmium.

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osmium Audio Help (ŏz'mē-əm) Pronunciation Key
Symbol Os
A hard, brittle, bluish-white metallic element that is the densest naturally occurring element. It is used to make very hard alloys for fountain pen points, electrical contacts, and instrument pivots. Atomic number 76; atomic weight 190.2; melting point 3,000°C; boiling point 5,000°C; specific gravity 22.57; valence 2, 3, 4, 8. See Periodic Table.

Free On-line Dictionary of Computing - Cite This Source - Share This

OS
1. operating system.
2. [obsolete, ITS], an output spy. See "OS and JEDGAR".
3. An operating system from IBM for their System/360 line of hardware announced in 1964. OS was planned with several flavours that were supposed to be compatible. OS was late, memory hungry and not able to reach the marketing objectives of IBM for the 360/30, the planned successor of the IBM 1401. IBM then decided to design a new operating system for the low end machines which they called DOS/360.
[The Jargon File]
(1997-09-22)

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Os\, n.; pl. Ossa. [L.] A bone.

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Os\, n.; pl. Ora. [L.] A mouth; an opening; an entrance.

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Os\, n.; pl. Osar. [Sw. [*a]s ridge, chain of hills, pl. [*a]sar.] (Geol.) One of the ridges of sand or gravel found in Sweden, etc., supposed by some to be of marine origin, but probably formed by subglacial waters. The osar are similar to the kames of Scotland and the eschars of Ireland. See Eschar.

American Heritage Abbreviations Dictionary 3rd Edition - Cite This Source - Share This

Os
osmium