adjective Chemistry.
containing tin, especially in the bivalent state.

1840–50; stann(um) + -ous Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
stannous (ˈstænəs)
of or containing tin, esp in the divalent state

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

stannous stan·nous (stān'əs)
Of, relating to, or containing tin, especially with valence 2.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
stannous   (stān'əs)  Pronunciation Key 
Containing tin, especially tin with a valence of 2. Compare stannic.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Metal salts such as stannous and zinc serve mostly as anti-bacterial substances in toothpastes.
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