1 Wide-reaching term, including all indeclinable word classes such as adverbs, conjunctions, prepositions and other particle classes such as scalar particles, discourse markers, modal particles, negation, interjections. 2 In a narrower sense: all...

// n. (Prt) 1. Traditionally, any lexical item which exhibits no inflectional morphology and hence is invariable in form; the term is only used in connection with languages in which the open classes Noun, Verb and Adjective do inflect. 2. In the...

In 1961 the physicist Murray Gell-Mann (1929- ) developed a method of organizing the dozens of subatomic particles that had been discovered to date. This classification system led him to realize that many of these particles were made up of even...

Besides its common definition, particle may refer to: In...

Should laser printers come with a surgeon general's warning?An Australian research team has found that some printers give off invisible particles as they operate, with the worst culprit emitting concentrations similar to those of secondhand tobacco smoke.But that doesn't mean you need a mask every...

The world's most ambitious particle collider _ which scientists hope could reveal what matter is made of _ might not be fully functional until next year, months after its scheduled startup date, officials at the European Organization for Nuclear Research said Thursday.Scientists have been scrambling...

A 43-foot-long magnet for the world's largest particle collider broke "with a loud bang and a cloud of dust" during a high-pressure test, and officials said Tuesday they are working to find a replacement part.The part that failed March 27 was in a super-cooled magnet...

The fine grit in polluted air raises the risk of heart disease in older women much more powerfully than scientists realized, a big U.S.-funded study has found, raising questions of whether U.S. environmental standards are strict enough.The U.S. Environmental Protection Agency tightened its daily limit...