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The protein coat that constitutes the shell of a virus particle.

[From Latin capsa, box.]


(Animals) any heteropterous bug of the family Miridae (formerly Capsidae), most of which feed on plant tissues, causing damage to crops
[C19: from New Latin Capsus (genus)]


(Biochemistry) the outer protein coat of a mature virus
[C20: from French capside, from Latin capsa box]


(ˈkæp sɪd)

the coiled or polyhedral structure, composed of proteins, that encloses the nucleic acid of a virus. Also called protein coat.
[1960–65; < French capside= Latin caps(a) case2 + -ide -id1]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.capsid - a variety of leaf bugcapsid - a variety of leaf bug    
leaf bug, plant bug - small bright-colored insect that feeds on plant juices
four-lined leaf bug, four-lined plant bug, Poecilocapsus lineatus - yellow or orange leaf bug with four black stripes down the back; widespread in central and eastern North America
lygus bug - vector of viral plant diseases
2.capsid - the outer covering of protein surrounding the nucleic acid of a virus
virion - (virology) a complete viral particle; nucleic acid and capsid (and a lipid envelope in some viruses)
protein - any of a large group of nitrogenous organic compounds that are essential constituents of living cells; consist of polymers of amino acids; essential in the diet of animals for growth and for repair of tissues; can be obtained from meat and eggs and milk and legumes; "a diet high in protein"
References in periodicals archive ?
Other symptoms of being possessed of a pesky DNA core in a sneaky protein coat include the deadening of both the olfactory and reasoning faculties.
TEHRAN (FNA)- Biochemists have uncovered patterns in the outer protein coat of group A Streptococcus that could finally lead to a vaccine against this highly infectious bacteria -- responsible for more than 500,000 deaths a year, including toxic shock syndrome and necrotizing fasciitis or 'flesh-eating disease.
The toxin poked holes in HIV's protective protein coat, leading to sharply reduced amounts of virus, the researchers report in Antiviral Therapy.
Washington, December 17 ( ANI ): A new model that depicts how the protein coat (capsid) of viruses assembles, reveals that the construction of intermediate structures prior to final capsid production (hierarchical assembly) can be more efficient than constructing the capsid protein by protein (direct assembly).
The team found that two distinct genetic variants on a particular region of HIV's protein coat called Env-V2 were associated with greater vaccine efficacy, and that the viruses that escaped the vaccine are mutated in this same region.
While spores naturally form in the environment and have the ability to persist for hundreds of years, the goal of this project is to understand the rigid protein coat and observe under what conditions the spore can be made vulnerable enough to kill.
The lead clinical candidate is a new class of agent containing three separate RNAi elements, simultaneously targeting three different sites of the Hepatitis C virus, and encapsidated in an adeno-associated virus (AAV) protein coat.
virus Any of various simple submicroscopic parasites of plants, animals and bacteria that often cause disease and that consist essentially of a core of RNA or DNA surrounded by a protein coat.
Cambridge MA) at the American Academy of Neurology showed Tysabri promoted the regeneration of the protein coat that protects nerve fibers and whose damage causes the symptoms of multiple sclerosis.
Viroids resemble viruses, but consist of only small RNA molecules that do not have the protein coat found on viruses and that do not encode any proteins.
Phages, like all viruses, are complex chemical entities consisting of a nucleic acid core covered by a protein coat and they may have contractile tail structures.
Nucleocapsid: the nucleic acid (see above) and protein coat (capsid) of a virus.