Osar

from The Collaborative International Dictionary of English v.0.48

Osar \O"sar\, n. pl. (Geol.)
   See 3d {Os}.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

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]

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

OSAR
       Optical Storage and Retrieval