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1. Physics a body with finite mass that can be treated as having negligible size, and internal structure
3. RC Church a small piece broken off from the Host at Mass


See elementary particles.



a member of a lexical-grammatical class of words that express the attitude of the speaker toward an utterance and that may be used to produce certain grammatical forms. An auxiliary part of speech, the particle is not a sentence part.

Particles exist in many languages, and the Slavic languages have a rather extensive system. In Russian, particles are divided into several semantic-functional types. Syntactic particles are used in the formation of the subjunctive, imperative, and optative moods (by, pust’, da, davai, davaite). Negative particles include tie and ni. Subjective modal particles modify the sense of other words or entire sentences; they include intensive particles (ved’, dazhe, -to, zhe), emphatic particles (toi’ko, lish’), interrogative particles (razve, neuzheli, li), and exclamatory particles (kak, chto zd). Particles are also used as affixes in the formation of pronouns and adverbs (koe-, -libo, -nibud’, -to).


Grammatika sovremennogo russkogo literaturnogo iazyka. Moscow, 1970.
Vinogradov, V. V. Russkii iazyk, 2nd ed. Moscow, 1972.



(particle physics)
Any very small part of matter, such as a molecule, atom, or electron. Also known as fundamental particle.
Any relatively small subdivision of matter, ranging in diameter from a few angstroms (as with gas molecules) to a few millimeters (as with large raindrops).
References in periodicals archive ?
Viral particles were found in all samples (n = 10) of eroded gill analyzed in this study.
Antibodies bind to and neutralize infectious viral particles while cytotoxic T-cells attack host cells, which synthesize the virus, before the virus is released into the circulation.
The diagnosis of NLVs from stool specimens is difficult and depends on the identification of the viral RNA by RT-PCR, direct visualization of the viral particles by EM, and/or evidence of a specific antibody response in acute- and convalescent-phase serum specimens (3).
Additionally, virus is transported to tissues of the salivary gland such that viral particles are secreted in saliva.
The use ofretroviruses are gene delivery requires the generation of producer cell lines from which viral particles can be harvested.
1,2,4] The primary means of HPV transmission to children is the ingestion of viral particles of infected cells from the birth can al, whereas in adults HPV is mainly transmitted through sexual contact.
However, if the immune system attacks all the viral particles vigorously, then the virus will continually develop new forms, an evolutionary search for the fittest form.
Seven of the 12 samples were sent to the Centers for Disease Control and Prevention and examined by direct electron microscopy for the presence of viral particles and by solid phase immune electron microscopy (SPIEM) (15) against sera to Norwalk virus previously obtained in volunteer studies.
18), this quantity of seminal fluid would contain 100,000 viral particles.
The capsid protein plays multiple essential roles in the virus life cycle including assembly of new viral particles and disassembly of the particle after the infection of a new cell.
Virus-like particles are empty and not infectious viral particles capable of incorporating antigens involved in different pathologies in order to potentiate and direct the humoral or cellular immune response.
Surviving viral particles thrown off by strong winds and storms can cause another outbreak in a different location.