This page provides all possible meanings and translations of the word viroids
U.S. National Library of MedicineRate this definition:(0.00 / 0 votes)
A group of pathogens comprising the smallest known agents of infectious disease. They are unencapsulated and are capable of replicating autonomously in susceptible cells. Positively identified viroids composed of single-stranded RNA have been isolated from higher plants, but the existence of DNA viroids pathogenic to animals is suspected.