subvirus

/sʌbˈvaɪrəs/
noun
  1. A biological entity that is smaller or simpler than a typical virus, such as a viroid, a virusoid, or a defective interfering particle.
    • Scientists discovered a new subvirus that infects plants and causes stunted growth.
    • A subvirus like the hepatitis delta virus requires a helper virus to replicate.
    • The textbook explained how a subvirus differs from a full virus in structure and function.
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