from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A mouth or an opening.
  • n. A bone.
  • n. See esker.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Bone.
  • n. A mouth; an opening.
  • n. In particular, either end of the cervix, internal (to the uterus) or external (to the vagina).
  • n. An osar or esker.

from the GNU version of the Collaborative International Dictionary of English

  • n. A bone.
  • n. A mouth; an opening; an entrance.
  • n. 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.
  • n. The chemical symbol for the element osmium.

from The Century Dictionary and Cyclopedia

  • An abbreviation of the Latin Ordo Sancti Francisci, Order of St. Francis.
  • n. Bone; a bone.
  • n. A mouth; a passage or entrance into any place: an anatomical term; specifically, the mouth of the womb.
  • n. In geology, a Swedish term for certain elongated ridges of detrital material, generally considered to be of glacial origin, or in some not yet clearly explained way connected with the former presence of ice in the region where they occur.
  • n. In chem., the symbol for osmium.
  • n. Same as os extrascapulare.
  • n. An abbreviation of the Latin Ordo Sancti Augustini, Order of St. Augustine.
  • n. An abbreviation of the Latin Ordo Sancti Benedicti, Order of St. Benedict.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the left eye
  • n. a mouth or mouthlike opening
  • n. a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known
  • n. rigid connective tissue that makes up the skeleton of vertebrates
  • n. (computer science) software that controls the execution of computer programs and may provide various services


from The American Heritage® Dictionary of the English Language, 4th Edition

Latin ōs, mouth; see ōs- in Indo-European roots.
Latin, bone; see ost- in Indo-European roots.
Swedish ås, ridge, from Old Norse āss.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From neuter Latin word os (genitive ossis) meaning "bone".

from Wiktionary, Creative Commons Attribution/Share-Alike License

From neuter Latin word os with the genitive oris (meaning "mouth").

from Wiktionary, Creative Commons Attribution/Share-Alike License



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  • I, then, am acquainted with no powers which are better or more appropriate than these; for extension along the spine downward has no proper hold at the bone called the os sacrum; and extension upward, along the neck and head, has indeed a hold; but extension thus made is unseemly to behold, and, besides, if increased, may occasion much mischief otherwise.

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  • See: od

    February 18, 2009

  • Os. Chemical element symbol for Osmium.

    December 16, 2007