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Definition of viroid in English: viroidnoun ˈvʌɪrɔɪdˈvaɪrɔɪd Microbiology An infectious entity affecting plants, smaller than a virus and consisting only of nucleic acid without a protein coat. 〔微生物〕（造成植物病害的）类病毒，无壳病毒 Example sentencesExamples - Prions do not contain DNA or RNA as do fungi, bacteria, viruses, viroids, or any other previously known infectious entities.
- They include animals, insects, and nematodes (while vine diseases include the microbes bacteria, fungi, phytoplasma, viroids, and virus).
- In 1971, ARS researchers determined that a viroid was the cause of potato spindle tuber disease, which previously had been identified as a virus.
- A single viroid was found to cause more than a dozen different plant diseases.
- Fast, accurate tests, based on antibody testing technology, were developed for trichinosis in pigs; for anaplasmosis, a costly parasitic disease in cattle; and for plant viruses and viroids.
Definition of viroid in US English: viroidnounˈvīroidˈvaɪrɔɪd Microbiology An infectious entity affecting plants, smaller than a virus and consisting only of nucleic acid without a protein coat. 〔微生物〕（造成植物病害的）类病毒，无壳病毒 Example sentencesExamples - Fast, accurate tests, based on antibody testing technology, were developed for trichinosis in pigs; for anaplasmosis, a costly parasitic disease in cattle; and for plant viruses and viroids.
- In 1971, ARS researchers determined that a viroid was the cause of potato spindle tuber disease, which previously had been identified as a virus.
- Prions do not contain DNA or RNA as do fungi, bacteria, viruses, viroids, or any other previously known infectious entities.
- They include animals, insects, and nematodes (while vine diseases include the microbes bacteria, fungi, phytoplasma, viroids, and virus).
- A single viroid was found to cause more than a dozen different plant diseases.
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