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  • mask

    A covering worn on or held in front of the face for disguise, to amuse, terrify or to symbolise.

  • mass spectrograph

    Mass spectroscope that record mass spectra on photographic plates.

  • mass spectrometer

    Mass spectroscope that identifies and records the kinds and intensities of particles in a given substance.

  • massage

    The rubbing or kneading of parts of the body especially to aid circulation, relax the muscles, or provide sensual stimulation.

  • massager

    Instrument used to give or accentuate impact of massage.

  • mastectomy

    The surgical removal of a breast or breasts.

  • match truck

    A wagon placed beneath an overhanging crane jib or freight load on an adjoining vehicle. Also used to mean a vehicle with more than one type of drawgear to enable wagons with non-compatible drawgear to be marshalled in the same train. In this thesaurus the latter sense is covered by the terms 'adaptor vehicle' and 'adaptor wagon'.

  • materia medica

    A Latin medical term sometimes used to refer to medical substances.

  • maximum & minimum thermometer

    Thermometer, mercury-in-glass type, with twin tubes fitted with marker to indicate the maximum and minimum reached over a period of time. Known as a 'Six's' or 'Maximum and mininium' thermometer the design was first made by James Six.

  • measles

    Disease caused by a virus most commonly found in children. Measles is spread through airborne fluids. In roughly the last 150 years, measles has been estimated to have killed 200 million people worldwide.

  • measure - volume

    A container of set known volume or capacity for measuring out fixed amounts of materials (gas, liquid or solid). Includes scientific capacity measures for verifying volumes, especially in commerce & trade.

  • measurement

    Measurement is the process of estimating the magnitude of some attribute of an object, such as its length or weight, relative to some standard (unit of measurement), such as a meter or a kilogram. The act of measuring usually involves using a measuring instrument, such as a ruler, weighing scale, thermometer or speedometer which is calibrated to compare the measured attribute to a measurement unit. Metrology is the scientific study of measurement.

  • measuring cup

    Graduated cuplike vessels used for measuring ingredients, as for cooks or chemists.

  • measuring cylinder

    piece of laboratory glassware used to accurately measure out volumes of chemicals for use in reactions. They are generally more accurate and precise for this purpose than flasks.

  • measuring device - instrument

    Device used to ascertain the value or extent of an object, with regard to size, volume, mass, position or comparison to a standard amount or property.

  • mechanical arm

    A false arm with the capability to replicate natural functions such as gripping.

  • mechanical horse

    A specialised road vehicle with a tight turning circle widely used by the railways for delivery purposes.

  • mechanical leech

    A mechanical device that promotes the flow of blood through surgical wounds. It was used to replicated the effects of having a real leech attached to the body but without the risk of infection.

  • mechanical lubricator

    An oil distribution system activated by pump action provided by mechanical connections to the valve gear of a steam locomotive.

  • medal

    Small pieces of metal, usually gold, silver, or bronze, bearing a relief design on one or both sides and having a commemorative purpose; not used as a medium of exchange. Medals may also be created to commemorate individuals or events or even as works of artistic expression in their own right.

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