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os

Os is a 2 letter word which starts with the letter O and ends with the letter S for which we found 3 definitions.

Definition
(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.
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