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os1

[os] /ɒs/
noun, plural ossa
[os-uh] /ˈɒs ə/ (Show IPA)
1.
Anatomy, Zoology. a bone.
Origin
1540-1550
1540-50; < Latin

os2

[os] /ɒs/
noun, plural ora
[awr-uh, ohr-uh] /ˈɔr ə, ˈoʊr ə/ (Show IPA)
1.
Anatomy, Zoology. a mouth or orifice of the body.
Origin
1730-40; < Latin ōs mouth

Ossa

[os-uh] /ˈɒs ə/
noun
1.
a mountain in E Greece, in Thessaly. 6490 feet (1978 meters).

os3

[ohs] /oʊs/
noun, plural osar
[oh-sahr] /ˈoʊ sɑr/ (Show IPA)
1.
Geology. an esker, especially when of great length.
Origin
< Swedish ås (plural åsar) ridge
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for ossa's

os1

/ɒs/
noun (pl) ossa (ˈɒsə)
1.
(anatomy) the technical name for bone
Word Origin
C16: from Latin: bone; compare Greek osteon

os2

/ɒs/
noun (pl) ora (ˈɔːrə)
1.
(anatomy, zoology) a mouth or mouthlike part or opening
Word Origin
C18: from Latin

os3

/əʊs/
noun (pl) osar (ˈəʊsɑː)
1.
another name for esker
Word Origin
C19 osar (pl), from Swedish ås (sing) ridge

Os

Chemical symbol
1.
osmium

OS

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)

ossa

/ˈɒsə/
noun
1.
the plural of os2

Ossa

/ˈɒsə/
noun
1.
a mountain in NE Greece, in E Thessaly: famous in mythology for the attempt of the twin giants, Otus and Ephialtes, to reach heaven by piling Ossa on Olympus and Pelion on Ossa. Height: 1978 m (6489 ft)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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ossa's in Medicine

os 1 (ŏs)
n. pl. o·ra (ôr'ə)

  1. An opening into a hollow organ or canal.

  2. The oral cavity; mouth.

os 2 (ŏs)
n. pl. os·sa (ŏs'ə)
Bone.

Os
The symbol for the element osmium.

OS abbr.
Latin oculus sinister (left eye)

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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ossa's in Science
Os  
The symbol for osmium.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Related Abbreviations for ossa's

Os

osmium

OS

  1. offscreen
  2. Old Saxon
  3. Old Style (calendar)
  4. operating system
  5. ordinary seaman
  6. out of stock

OSSA

Office of Space Science and Applications
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Article for ossa's

Os

(Os), chemical element, one of the platinum metals of Group VIIIb of the periodic table and the densest naturally occurring element. A gray-white metal, osmium is very hard, brittle, and difficult to work, even at high temperatures. Of the platinum metals it has the highest melting point, so fusing and casting are difficult. Osmium wires were used for filaments of early incandescent lamps before the introduction of tungsten. It has been used chiefly as a hardener in alloys of the platinum metals, though ruthenium has generally replaced it. A hard alloy of osmium and iridium has been used for tips of fountain pens and phonograph needles, and osmium tetroxide is used in certain organic syntheses.

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Ossa

mountain massif, nomos (department) of Larissa, eastern Thessaly, Greece. It lies on the Gulf of Thermai and is separated on the north from the Olympus massif by the Vale of Tempe (Tembi). Rising from a broad, steep-sided plateau to a pyramidal peak of 6,489 feet (1,978 m), the mountain is noted in mythology for the attempt of the Aloads, sons of the sea god Poseidon, to climb to heaven by placing Ossa on Olympus and the Pelion mountains on Ossa.

Learn more about Ossa with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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