1. plural of os1.


  1. a mountain in E Greece, in Thessaly. 6490 feet (1978 meters).

noun, plural os·sa [osuh] /ˈɒs ə/.

  1. Anatomy, Zoology. a bone.

noun, plural o·ra [awruh, ohruh] /ˈɔr ə, ˈoʊr ə/.

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

noun, plural o·sar [oh-sahr] /ˈoʊ sɑr/.

  1. Geology. an esker, especially when of great length.


  1. the plural of os 2


  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)

the chemical symbol for

  1. osmium

abbreviation for

  1. Old School
  2. Old Style (method of reckoning dates)
  3. Ordinary Seaman
  4. (in Britain) Ordnance Survey
  5. outsize
  6. Old Saxon (language)

noun plural ossa (ˈɒsə)

  1. anatomy the technical name for bone

noun plural ora (ˈɔːrə)

  1. anatomy zoology a mouth or mouthlike part or opening

noun plural osar (ˈəʊsɑː)

  1. another name for esker

  1. The symbol for the elementosmium


  1. oculus sinister (left eye)

  1. The symbol for osmium.

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