| 单词 | particle |
| 释义 | particle (once / 454 pages) 1n 2n A particle is a small piece of anything. Particle can also refer to a subatomic particle with mass and structure, but takes up hardly any space at all. Particles are tiny. If you mean a subatomic particle, that's a body that you can't see because it is so incredibly small, though it does have a miniscule mass and internal structure. These particles are even smaller than atoms. You can also say a crumb or speck of something is a particle. Dust particles are piling up all the time, and vacuuming cleans up lots of particles. Those particles are little bits of things. In both cases, particles are very tiny. WORD FAMILYparticle: antiparticle, particles+/antiparticle: antiparticles USAGE EXAMPLESProposed sources of dark matter include burnt-out stars; clouds of dust and gas; and subatomic particles called Wimps – weakly interacting massive particles. The Guardian(Dec 31, 2016) On Thursday, it said the main problem involves a cylindrical vessel filled with billions of tiny sandlike particles that is heated to 1,200 degrees. Seattle Times(Dec 30, 2016) Stalling emissions should also spell better health, because coal burning in particular pollutes the air with lung-shredding particles and choking chemicals. The Guardian(Dec 30, 2016) 1 1n (nontechnical usage) a tiny piece of anything Syn|Hypo|Hyper atom, corpuscle, molecule, mote, speck grain a relatively small granular particle of a substance grindingmaterial resulting from the process of grinding chylomicrona microscopic particle of triglycerides produced in the intestines during digestion; in the bloodstream they release their fatty acids into the blood flyspecka tiny dark speck made by the excrement of a fly identification particlea tiny particle of material that can be added to a product to indicate the source of manufacture granulea tiny grain Microtaggant(trademark) a microscopic and traceable identification particle used to trace explosives or other hazardous materials or to prevent counterfeiting material, stuff the tangible substance that goes into the makeup of a physical object 2n a body having finite mass and internal structure but negligible dimensions 2Syn|Hypo|Hyper subatomic particle virion (virology) a complete viral particle; nucleic acid and capsid (and a lipid envelope in some viruses) alpha particlea positively charged particle that is the nucleus of the helium atom; emitted from natural or radioactive isotopes beta particlea high-speed electron or positron emitted in the decay of a radioactive isotope bosonany particle that obeys Bose-Einstein statistics but not the Pauli exclusion principle; all nuclei with an even mass number are bosons deuteronthe nucleus of deuterium; consists of one proton and one neutron; used as a bombarding particle in accelerators elementary particle, fundamental particle(physics) a particle that is less complex than an atom; regarded as constituents of all matter fermionany particle that obeys Fermi-Dirac statistics and is subject to the Pauli exclusion principle iona particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons magnetic monopolea hypothetical particle with a single magnetic pole instead of the usual two micellean electrically charged particle built up from polymeric molecules or ions and occurring in certain colloidal electrolytic solutions like soaps and detergents prion(microbiology) an infectious protein particle similar to a virus but lacking nucleic acid; thought to be the agent responsible for scrapie and other degenerative diseases of the nervous system virino(microbiology) a hypothetical infectious particle thought to be the cause of scrapie and other degenerative diseases of the central nervous system; consists of nucleic acid in a protective coat of host cell proteins scintillaa sparkling glittering particle superstringa hypothetical particle that is the elementary particle in a theory of space-time thermionan electrically charged particle (electron or ion) emitted by a substance at a high temperature aniona negatively charged ion antileptonthe antiparticle of a lepton antiparticlea particle that has the same mass as another particle but has opposite values for its other properties; interaction of a particle and its antiparticle results in annihilation and the production of radiant energy antiquarkthe antiparticle of a quark baryon, heavy particleany of the elementary particles having a mass equal to or greater than that of a proton and that participate in strong interactions; a hadron with a baryon number of +1 cationa positively charged ion gauge bosona particle that mediates the interaction of two elementary particles hadronany elementary particle that interacts strongly with other particles leptonan elementary particle that participates in weak interactions; has a baryon number of 0 meson, mesotronan elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0 quark(physics) hypothetical truly fundamental particle in mesons and baryons; there are supposed to be six flavors of quarks (and their antiquarks), which come in pairs; each has an electric charge of +2/3 or -1/3 strange particlean elementary particle with non-zero strangeness cosmic string, string(cosmology) a hypothetical one-dimensional subatomic particle having a concentration of energy and the dynamic properties of a flexible loop WIMP, weakly interacting massive particlea hypothetical subatomic particle of large mass that interacts weakly with ordinary matter through gravitation; postulated as a constituent of the dark matter of the universe body an individual 3-dimensional object that has mass and that is distinguishable from other objects n a function word that can be used in English to form phrasal verbs Hyper closed-class word, function word a word that is uninflected and serves a grammatical function but has little identifiable meaning |
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