Anatomical Structure
capsid Audio
cap·sid [ kap-sid ]
Subclass of:
Nucleocapsid
Definitions related to capsid:
  • Protein shell which surrounds the virus nucleic acid; has icosahedral, helical, or complex symmetry.
    CRISP Thesaurus
    National Institutes of Health, 2006
  • The outer protein protective shell of a virus, which protects the viral nucleic acid. Capsids are composed of repeating units (capsomers or capsomeres) of CAPSID PROTEINS which when assembled together form either an icosahedral or helical shape.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
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