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subvirus

(sŭb-vīrəs)
n. pl. sub•vi•rus•es
  1. A viral protein or other substance smaller than a virus and having some viral properties.
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Related formssub•viral (-rəl) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.