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A.Word.A.Daywith Anu Garg
1. A mouth or an orifice. [plural ora]
2. A bone. [plural ossa]
For 1: From Latin os (mouth). Earliest documented use: 1859.
For 2: From Latin os (bone). Earliest documented use: 1400.
It also appears as an abbreviation in many fields, including
Chemistry: Os - symbol for the element osmium
Computing: OS - Operating System
Medicine: OS - left eye (from Latin oculus sinister)
Linguistics: OS - Old Saxon
"Naturally, the students couldn't resist testing the teachers' knowledge. 'You'd better slow down,' they would tell some unsuspecting pedagogue, 'or you might fall and break your os.'"
D.L. Stanley; I Hope This Doesn't Effectuate Your Dudgeon; Atlanta Inquirer (Georgia); Nov 16, 1996.
See more usage examples of os in Vocabulary.com’s dictionary.
A THOUGHT FOR TODAY:No sensible decision can be made any longer without taking into account not only the world as it is, but the world as it will be. -Isaac Asimov, scientist and writer (1920-1992)