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street furniture
street hockey
street luge
street name
street-smart
street smarts
street theater
street value
street virus
streetcar
streetlight
streetscape
streetwalker
streetwear
streetwise
strelitzia
strength
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street virus
street vi·rus (plural street vi·rus·es)


noun 
Definition:
 
natural strain of virus: the natural virulent strain of a virus as distinguished from a less virulent strain of the same organism that has been grown or treated in a laboratory
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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