Definition

1. Noun:
   • A subviral infectious agent: A viroid is the smallest known infectious pathogen, consisting solely of a short strand of circular, single-stranded RNA without a protein coat.
   • A plant pathogen: Viroids are specifically known to cause diseases in plants, not in animals or bacteria.

Usage Examples

• Noun:
  • The potato spindle tuber disease is caused by a viroid.
  • Scientists study the viroid to understand the most basic mechanisms of infection.
  • Unlike a virus, a viroid lacks a protein coat.

Advanced Usage

• In molecular biology: The term is used to describe the simplest known biological replicating agent, often studied for insights into the origins of life and fundamental genetics.
  • Research into viroids provides clues about the RNA world hypothesis.

Variants and Related Words

• Viroid-like: (adjective) Having characteristics similar to a viroid.
  • The agent has a viroid-like RNA structure.
• Viroidology: (noun) The study of viroids.
  • He specializes in the field of viroidology.

Synonyms

• Subviral agent: A broader term for infectious entities simpler than viruses, which includes viroids.
• Pathogenic RNA: Descriptive term highlighting its infectious, RNA-based nature.

Related Phrases

• Viroid replication: The process by which viroids copy themselves within a host cell.
  • The mechanism of viroid replication is unique.
• Viroid disease: A plant illness caused by a viroid infection.
  • The orchard was quarantined due to a viroid disease.

Noun

1. the smallest of viruses; a plant virus with its RNA arranged in a circular chromosome without a protein coat