apparatus

Your apparatus is the collective equipment you use for specific purposes. For example, the apparatus used for scuba diving includes goggles, flippers, and a breathing tank, while a surgeon’s apparatus includes various scalpels and clamps. Different activities, different apparatuses.

The noun apparatus evolved from the Latin apparātus, meaning "equipment or preparation." It might refer to one item, (a breathing apparatus) or a group of items (sports apparatus). Here’s a spelling tip: often, when a word ends in -us, the plural ending changes to i — “alumnus/alumni,” “focus/foci.” However, apparatus is part of the group that doesn't change — words like “virus/viruses” or “census/censuses.” This means the plural is either apparatus or apparatuses, though the latter is more common.

Definitions of apparatus
  1. noun
    equipment designed to serve a specific function
    synonyms: setup
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    types:
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    aerator
    an apparatus for exposing something to the air (as sewage)
    burner
    an apparatus for burning fuel (or refuse)
    cascade liquefier
    an apparatus used to liquefy air or oxygen etc.
    centrifuge, extractor, separator
    an apparatus that uses centrifugal force to separate particles from a suspension
    chemical reactor
    an apparatus for holding substances that are undergoing a chemical reaction
    condenser
    an apparatus that converts vapor into liquid
    copier, duplicator
    apparatus that makes copies of typed, written or drawn material
    electrograph
    an apparatus for the electrical transmission of pictures
    generator
    an apparatus that produces a vapor or gas
    heat pump
    apparatus that extracts heat from a liquid that is at a higher temperature than its surroundings; can be used to transfer heat from a reservoir outside in order to heat a building
    heliograph
    an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on
    brooder, incubator
    apparatus consisting of a box designed to maintain a constant temperature by the use of a thermostat; used for chicks or premature infants
    instillator
    medical apparatus that puts a liquid into a cavity drop by drop
    Kipp's apparatus
    a laboratory apparatus for producing a gas (usually hydrogen sulfide) by the action of a liquid on a solid without heating
    lighting
    apparatus for supplying artificial light effects for the stage or a film
    nuclear reactor, reactor
    (physics) any of several kinds of apparatus that maintain and control a nuclear reaction for the production of energy or artificial elements
    optical bench
    apparatus for observation and measurement of optical phenomena
    pendulum
    an apparatus consisting of an object mounted so that it swings freely under the influence of gravity
    purifier
    an apparatus for removing impurities
    reformer
    an apparatus that reforms the molecular structure of hydrocarbons to produce richer fuel
    semaphore
    an apparatus for visual signaling with lights or mechanically moving arms
    sequenator, sequencer
    (chemistry) an apparatus that can determine the sequence of monomers in a polymer
    soda fountain
    an apparatus for dispensing soda water
    still
    an apparatus used for the distillation of liquids; consists of a vessel in which a substance is vaporized by heat and a condenser where the vapor is condensed
    submersible
    an apparatus intended for use under water
    telegraph, telegraphy
    apparatus used to communicate at a distance over a wire (usually in Morse code)
    titrator
    an apparatus for performing a titration
    X-ray machine
    an apparatus that provides a source of X rays
    atomic pile, atomic reactor, chain reactor, pile
    a nuclear reactor that uses controlled nuclear fission to generate energy
    backlighting
    lighting from behind
    bathyscape, bathyscaph, bathyscaphe
    navigable deep diving vessel for underwater exploration
    bathysphere
    spherical deep diving apparatus (lowered by a cable) for underwater exploration
    blowlamp, blowtorch, torch
    a burner that mixes air and gas to produce a very hot flame
    breeder reactor
    a nuclear reactor that produces more fissile material than it burns
    cat cracker, catalytic cracker
    a chemical reactor for converting oils with high boiling points into fuels with lower boiling points in the presence of a catalyst
    Coffey still
    a still consisting of an apparatus for the fractional distillation of ethanol from fermentation on an industrial scale
    diving bell
    diving apparatus for underwater work; has an open bottom and is supplied with compressed air
    facsimile, facsimile machine, fax
    duplicator that transmits the copy by wire or radio
    fast reactor
    nuclear reactor in which nuclear fissions are caused by fast neutrons because little or no moderator is used
    fluoroscope, roentgenoscope
    an X-ray machine that combines an X-ray source and a fluorescent screen to enable direct observation
    Foucault pendulum
    pendulum with a long wire; can swing in any direction; the change in the swing plane demonstrates the earth's rotation
    gas bracket
    a pipe with one or more burners projecting from a wall
    gas burner, gas jet
    burner such that combustible gas issues from a nozzle to form a steady flame
    gas-cooled reactor
    a nuclear reactor using gas as a coolant
    hectograph, heliotype
    duplicator consisting of a gelatin plate from which ink can be taken to make a copy
    haematocrit, hematocrit
    a measuring instrument to determine (usually by centrifugation) the relative amounts of corpuscles and plasma in the blood
    Liebig condenser
    a condenser: during distillation the vapor passes through a tube that is cooled by water
    liquid metal reactor
    a nuclear reactor using liquid metal as a coolant
    lithograph, lithograph machine
    duplicator that prints by lithography; a flat surface (of stone or metal) is treated to absorb or repel ink in the desired pattern
    metronome
    clicking pendulum indicates the exact tempo of a piece of music
    Roneo, Roneograph, mimeo, mimeograph, mimeograph machine
    a rotary duplicator that uses a stencil through which ink is pressed (trade mark Roneo)
    minisub, minisubmarine
    submersible vessel for one or two persons; for naval operations or underwater exploration
    photocopier
    a copier that uses photographic methods of making copies
    Photostat, Photostat machine
    a duplicating machine that makes quick positive or negative copies directly on the surface of prepared paper
    compound pendulum, physical pendulum
    pendulum consisting of an actual object allowed to rotate freely around a horizontal axis
    reflux condenser
    condenser such that vapor over a boiling liquid is condensed and flows back into the vessel to prevent its contents from boiling dry
    scrubber
    a purifier that removes impurities from a gas
    simple pendulum
    a hypothetical pendulum suspended by a weightless frictionless thread of constant length
    thermal reactor
    a nuclear reactor in which nuclear fissions are caused by neutrons that are slowed down by a moderator
    fusion reactor, thermonuclear reactor
    a nuclear reactor that uses controlled nuclear fusion to generate energy
    tomograph
    X-ray machine in which a computer builds a detailed image of a particular plane through an object from multiple X-ray measurements
    ultracentrifuge
    a high speed centrifuge used to determine the relative molecular masses of large molecules in high polymers and proteins
    water-cooled reactor
    nuclear reactor using water as a coolant
    Xerox, Xerox machine, xerographic copier
    a duplicator (trade mark Xerox) that copies graphic matter by the action of light on an electrically charged photoconductive insulating surface in which the latent image is developed with a resinous powder
    type of:
    equipment
    an instrumentality needed for an undertaking or to perform a service
  2. noun
    (anatomy) a group of body parts that work together to perform a given function
    “the breathing apparatus
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    types:
    auditory apparatus
    all of the components of the organ of hearing including the outer and middle and inner ears
    type of:
    body part
    any part of an organism such as an organ or extremity
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