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  • nicotine

    A chemical compound that forms 0.6-3.0 per cent of the dry weight of tobacco. Nicotine acts as a stimulant in mammals, and is one of the primary reasons for smoking addiction.

  • night light

    Small lamps intended for use in the bedroom or sickroom. Originally glass float lamps; also includes miniature, especially glass, oil and kerosene lamps of the late 19th and early 20th centuries.

  • nipple shield

    A plastic or glass cap or dome used by breastfeeding mothers to help babies to latch onto the breast and/or to protect sore or cracked nipples.

  • nitrous oxide

    Nitrogen oxide. A colourless, odourless gas that is used as an anaesthetic and analgesic. High concentrations cause a narcotic effect and may replace oxygen, causing death by asphyxia. It is also used as a food aerosol in the preparation of whipping cream.

  • NMR

    Nuclear magnetic resonance is a technique used to detect what chemicals make up a sample containing unknown materials, or proportions of material. The sample is exposed to radio waves, and the frequency of electromagnetic energy that the sample absorbs is recorded. Because different atoms absorb unique frequencies of radiation, it is possible to determine what sort of atoms are present in the sample. NMR is now known as Magnetic Resonance Imaging (MRI).

  • Nobel Prize

    Awarded annually for outstanding work in physics, chemistry, physiology or medicine, literature, economics, and the promotion of peace.

  • non-invasive

    A technique that does not require the use of instruments inside the body.

  • Nooth's apparatus

    device to mix carbon dioxide and water for medicinal uses

  • nose

    The prominent part of the face or anterior extremity of the head that lies above the mouth containing the nostrils and olfactory cavities; the olfactory organ.

  • nose spectacles - pince nez

    Type of spectacles supported by the nose, used to compensate for defective vision. Similar to bow spectacles,they are characterised by a C-shaped metal spring bridge, often fitted with pads, that clips onto the nose. Pinch-nez (nose-pinching from the French) first appeared in the late 19th century and were popular for the next 40 years.

  • note

    Brief statements of a fact or experience, written down for review, or as an aid to memory, or to inform someone else; also includes short, informal letters.

  • notebook

    Books of blank pages, usually ruled, used for taking notes, especially by pupils and students for taking class notes or writing or drawing exercises.

  • notebooks

    Books in which notes or memorandums are recorded, such as are used for taking notes during a class, lecture, or meeting. GAHLM.

  • notes

    Use for brief statements of a fact or experience, written down for review, or as an aid to memory, or to inform someone else; also includes short, informal letters. ICA.

  • number plate

    A plate (usually of cast metal) bearing the owner's running number for the vehicle. For plates bearing any other number, use the appropriate term (e.g. 'works plate' for a plate bearing the works number, 'allocation plate' for a plate bearing the shed code of the shed to which a locomotive was allocated, etc.). Some rolling stock running number plates may bear other information such as the date of building, builder's name, lot number, etc. However, these should still be regarded primarily as a 'number plate', although they may be cross-referenced under 'works plate' if desired.

  • nursing

    The study and practice of caring for and waiting on the sick, injured, or others unable to look after themselves or to deal with their specific medical needs.

  • nursing kit

    Group of objects collectively used by nurses working outside of a hospital.

  • nut dish

    Small dish for holding nuts.

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