viroid.
Any of many short sections of RNA, but without the protein coat typical of viruses (the capsid), that are plant pathogens.
Meaning & usage
Any of many short sections of RNA, but without the protein coat typical of viruses (the capsid), that are plant pathogens.
Any of certain defective viruses, such as hepatitis D, a human pathogen.
Where this word comes from
Etymology tree Proto-Indo-European *weys- Proto-Indo-European *wisós Proto-Italic *weizos Latin vīrusbor. Middle English virus English virus Ancient Greek -ο- (-o-)der. Latin -o- Proto-Indo-European *weyd- Proto-Indo-European *-os Proto-Indo-European *wéydos Proto-Hellenic *wéidos Ancient Greek εἶδος (eîdos) Proto-Indo-European *-os Proto-Indo-European *-ēs Proto-Hellenic *-ēs Ancient Greek -ης (-ēs) Ancient Greek -ειδής (-eidḗs) Latin -oīdēslbor. English -oid English viroid From virus + -oid.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.