from The American Heritage® Dictionary of the English Language, 4th Edition
- 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. plant pathogens, of the order Viroidales, that consist of just a short section of RNA but without the protein coat typical of viruses
- n. human pathogen, most notably hepatitis D.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the smallest of viruses; a plant virus with its RNA arranged in a circular chromosome without a protein coat
Sorry, no etymologies found.
Locking her arms around the doctor despite his indignant yelp, she whirled him away from the entrance and beyond the snaking grasp of one of the viroid creatures.
"You've got a shipload of viroid life-forms outside draining our power systems, and I've got a Trill symbiont in the infirmary who says it can help us."
"What we have here isn't an Andorian who's been infected by some alien virus's DNAwe have a viroid life-form that's absorbed an Andorian's genetic code for its own selective usage."
For the moment, symptomatic treatment was in order, then detailed analysis of the virus or viroid.
If you find so much as a pre-biotic spherule, a pseudo-membranous configuration, even a viroid aggregate, the show's off.
In fact, it turned out that a disease that had nearly wiped out the American mum industry in the mid-1950s had been caused by a viroid of their own.
The enzymes use the viroid as a template to make a new viroid progeny.
Yet that's enough genetic information to let a viroid infect a plant and replicate itself by taking advantage of the enzymes the plant uses to replicate its DNA.
(For some reason, no one has found an animal viroid.)
Vacuolar apoplastic localization leaf tissue tomato plants infested citrus exocortis viroid; vitro synthesis processing.