n. 骨, 孔, 穴裂口

[计] 办公系统, 操作系统

[医] 锇(76号元素)

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


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


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}.


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