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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 ?
Look for high efficiency for small particles when respiratory conditions, immune disorders or cardiovascular disease are present, and when asthma is triggered by strong odors and fumes.
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As the water molecules zip around, they knock the visible particles from place to place, creating Brownian motion.
Since washing of HA with water or other solutions are known to modify the surface properties of HA [32], exposure of the nano particles to additional solution environments is likely to result in significant interactions between particle surfaces and the solvent, leading to modifications of the surface properties and a reduction in the high reactivity innate to the small size, high surface area, nano particles.
Unlike infection with the hepatitis C virus-229E, wherein virus production can continue for weeks without any expression of cytopathic effects (18,19), infection with SARS-CoV produces copious progeny virus particles within the first 12 h (10).
To prevent oxidation problems and still take advantage of the high recording density potential of MP media, metal particles used in DDS media are typically coated with a passivation layer material.