Zone refining
a process of purifying any of various metals and other materials, as germanium or silicon, by passing it in bar form through an induction coil.
noun
a technique for producing solids of extreme purity, esp for use in semiconductors. The material, in the form of a bar, is melted in one small region that is passed along the solid. Impurities concentrate in the melt and are moved to the end of the bar
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- Zone something out
zone something out noun (also zoner) A person intoxicated with narcotics, esp habitually so; space cadet (1960s+ Narcotics) verb To be inattentive; be hazily preoccupied: He zoned so bad he didn’t even hear the teacher call his name/ I was kind of zonin’, checking things out (1980s+) [fr ozone, ”a very high level of the […]
- Zone system
a system for envisioning the values to appear in a black-and-white print and for determining exposure and development, based on a scale of shades ranging from 0 (black) to IX (white). Historical Examples When the introduction of the zone system was first advocated in Hungary it was opposed by just such men and just such […]
- Zone time
standard time as applied at sea, reckoned according to the system of time zones.
- Zone-leaching
. zone of leaching See A horizon.
- Zoned
any continuous tract or area that differs in some respect, or is distinguished for some purpose, from adjoining tracts or areas, or within which certain distinctive circumstances exist or are established. Geography. any of five great divisions of the earth’s surface, bounded by lines parallel to the equator and named according to the prevailing temperature. […]