[proh-vahy-ruhs, proh-vahy-]
noun, plural proviruses.
a viral form that is incorporated into the genetic material of a host cell.

1945–50; pro-1 + virus, on the model of prophage Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
provirus (ˈprəʊˌvaɪrəs)
the inactive form of a virus in a host cell

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

provirus pro·vi·rus (prō'vī'rəs, prō-vī'-)
n. pl. pro·vi·rus·es
The precursor or latent form of a virus that is capable of being integrated into the genetic material of a host cell and being replicated with it.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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