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Longman Dictionary of Contemporary English
extractor
noun
COLLOCATIONS FROM CORPUS
■ NOUN
fan
▪ As extractor fan fitted into the apex of the greenhouse at one end and controlled by a thermostat works efficiently.
▪ The kitchen should be well ventilated, and an extractor fan is an efficient way of doing this without creating draughts.
▪ The blades of the small extractor fan were still.
▪ This is effected by means of extractor fan system, the air entering close to the ceiling and leaving close to ground level.
EXAMPLES FROM CORPUS
▪ An extractor system and masks had not been effective.
▪ Or mechanical extractor ventilation capable of providing at least three air changes per hour and operating with 15-minute overrun after activation.
▪ Regrettably, it is still possible to find outmoded, noisy extractor fans in use in some facilities.
▪ The extractor has multi-cell capability with a small footprint.
▪ The extractor is connected to the bar pump by a plastic beer line.
▪ The air is cleaned and then recirculated without the loss of expensively generated heat that occurs with extractor fans.
▪ This would include things like providing adequate guarding, wiring up properly in accordance with electrical regulations, installing fume extractor equipment, etc.
▪ We're probably breaking Health and Safety regulations: there should be extractor fans.
The Collaborative International Dictionary
Extractor

Extractor \Ex*tract"or\, n.

  1. One who, or that which, extracts; as:

    1. (Surg.) A forceps or instrument for extracting substances.

    2. (Breech-loading Firearms) A device for withdrawing a cartridge or spent cartridge shell from the chamber of the barrel.

  2. A centrifugal drying machine.

  3. (Apiculture) A machine for clearing combs of honey; also, a device for rendering wax.

Wiktionary
extractor

n. 1 Any of various mechanical devices that extract a component from others. 2 # A machine for clearing combs of honey. 3 # A device for rendering wax. 4 (context chemistry English) An apparatus that uses a solvent to remove soluble substances from a mixture. 5 A centrifugal drying machine. 6 (context in a gun English) A part of the bolt that removes a cartridge from the chamber. 7 (context graph theory English) A particular kind of bipartite graph. 8 A function which, being applied to output from a weakly random entropy source, together with a short, uniformly random seed, generates a highly random output that appears independent from the source and uniformly distributed.

WordNet
extractor
  1. n. an instrument for extracting tight-fitting components

  2. an apparatus that uses centrifugal force to separate particles from a suspension [syn: centrifuge, separator]

  3. a mechanism in a firearm that pulls an empty shell case out of the chamber and passes it to the ejector [syn: cartridge extractor, cartridge remover]

Wikipedia
Extractor (mathematics)

An (N, M, D, K, ε) -extractor is a bipartite graph with N nodes on the left and M nodes on the right such that each node on the left has D neighbors (on the right), which has the added property that for any subset A of the left vertices of size at least K, the distribution on right vertices obtained by choosing a random node in A and then following a random edge to get a node x on the right side is ε-close to the uniform distribution in terms of total variation distance.

A disperser is a related graph.

An equivalent way to view an extractor is as a bivariate function


E : [N] × [D] → [M]

in the natural way. With this view it turns out that the extractor property is equivalent to: for any source of randomness X that gives n bits with min-entropy logK, the distribution E(X, U) is ε-close to U, where U denotes the uniform distribution on [T].

Extractors are interesting when they can be constructed with small K, D, ε relative to N and M is as close to KD (the total randomness in the input sources) as possible.

Extractor functions were originally researched as a way to extract randomness from weakly random sources. See randomness extractor.

Using the probabilistic method it is easy to show that extractor graphs with really good parameters exist. The challenge is to find explicit or polynomial time computable examples of such graphs with good parameters. Algorithms that compute extractor (and disperser) graphs have found many applications in computer science.

Extractor (firearms)

An extractor is a part in a firearm that serves to remove brass cases of fired ammunition after the ammunition has been fired. When the gun's action cycles, the extractor lifts or removes the spent brass casing from the firing chamber.

Extractor

Extractor may refer to:

  • Extractor (firearms)
  • Extractor (mathematics)
  • Extractor (screws), a tool used to remove broken screws
  • Randomness extractor
  • Soxhlet extractor
  • Extractor, a device found in a Bite & Sting kit, used as part of the first-aid for a snake bite.

Usage examples of "extractor".

The Extractor selects and draws pre-designated elements, minerals and other usable substances from the Alpha Centauri star system, and collects, accumulates, converts and channels the matter into its spunnel transmission subsystem for direct interstellar transfer to the Collector.

The Extractor and Collector terminals are constructed four million kilometers beyond Planet Pluto.

Position the Extractor in orbit above Alpha Centauri at a location commensurate with data provided previously by drone scouts.

Disengaged from Pluto, the Extractor fleet accelerates along its course to optimum velocity through integrated thrust of augmented thrusters or other more advanced propulsion systems that are or become available in time to accomplish the Objective.

Crank in the latest estimates on the years it will take for the Extractor to reach Alpha Centauri, get organized around the job, go online, and begin to produce.

That includes the launch schedule of the Extractor station to Alpha Centauri.

When the launch window opens, and it will be open to us for only a very brief time, the Extractor must depart -- there will be no second chance for several centuries.

The Extractor must fly as fast and as true as the missile did from the sling of David to the head of Goliath.

When the Extractor has departed, we will no longer need the logistics depot, and UIPS citizens in the Zone will return home.

Epilogue The networks of mass attractors that tethered the Extractor to Planet Pluto disengaged nine Earth centuries after construction began.

It would be the final signal to synchronize and activate the collective controls of the Extractor and Collector.

The Extractor selects and draws usable non-organics from the Alpha Centauri star system, and collects, converts and channels the product into its teleport shipping facility for point-to-point spunnel transfer to the Collector.

Deploy the Extractor to Alpha Centauri and position it in orbit above a point commensurate with data provided by the drone scouts.

Stages The Extractor, in position at destination, analyzes, selects and draws substance from proximate asteroids, comets, satellites, planetoids, swarms, star surface and other accessible bodies and strata, reduces the substance to spunnel-teleportable constituents, loads the mass into the spunnel facility and dispatches the product.

Disengaged from Pluto, the Extractor fleet will accelerate along its course to optimum velocity through integrated thrust of multiple thermonuclear burst-propulsion systems or other, more advanced propulsion systems, that are or become available for the Task.