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OS    : ['ɑs]
O \O\ ([=o]), n.; pl. {O's} or {Oes} ([=o]z).
1. The letter O, or its sound. "Mouthing out his hollow oes
and aes." --Tennyson.
[1913 Webster]

2. Something shaped like the letter O; a circle or oval.
"This wooden O [Globe Theater]". --Shak.
[1913 Webster]

3. A cipher; zero. [R.]
[1913 Webster]

Thou art an O without a figure. --Shak.
[1913 Webster]


Os \Os\, n.; pl. {Ossa}. [L.]
A bone.
[1913 Webster]


Os \Os\, n.; pl. {Ora}. [L.]
A mouth; an opening; an entrance.
[1913 Webster]


Os \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}.
[1913 Webster]


Os \Os\, n. (Chem.)
The chemical symbol for the element {osmium}.
[PJC]

os
n 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 [synonym:
{osmium}, {Os}, {atomic number 76}]
3: (computer science) software that controls the execution of
computer programs and may provide various services [synonym:
{operating system}, {OS}]
4: the left eye [synonym: {oculus sinister}, {OS}]
5: rigid connective tissue that makes up the skeleton of
vertebrates [synonym: {bone}, {os}]



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English Dictionary  2005-2009

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