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ordinary seaman

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ordinary seaman

–noun
a seaman insufficiently skilled to be classified as an able-bodied seaman. Abbreviation: O.D., O.S., o.s.

Origin:
1695–1705
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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ordinary seaman  
n.   Abbr. OS
A seaman of the lowest grade in the merchant marine.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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