Medical term:

viroid





viroid

 [vi´roid]
any of a class of infectious agents consisting of a small strand of RNA not associated with any protein. The RNA does not code for proteins and is not translated; it is replicated by host cell enzymes. Viroids are known to cause several plant diseases.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

vi·roid

(vī'royd),
An infectious pathogen of plants that is smaller than a virus (MW 75,000-100,000) and differs from one in that it consists only of single-stranded closed circular RNA, lacking a protein covering (capsid); replication does not depend on a helper virus, but is mediated by host cell enzymes.
[virus + G. eidos, resemblance]
Farlex Partner Medical Dictionary © Farlex 2012

viroid

(vī′roid′)
n.
An infectious particle, similar to but smaller than a virus, that consists solely of a strand of RNA and is capable of causing disease in plants.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

vi·roid

(vī'royd)
A viruslike agent of plant diseases containing RNA but no protein.
[virus + G. eidos, resemblance]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

viroid

a virus-like pathogenic structure consisting of an RNA molecule, but with no protein coat.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005


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