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  • objective

    The lens in a microscope that is nearest to the object being examined.

  • obsidian

    A black or very dark volcanic rock. Obsidian was shattered into very sharp blades and sometimes used as a tool for working marble on a small scale.

  • obstetrical forceps

    An instrument used to assist the delivery of a foetus, usually during a birth where complications have developed. Numerous variations have been developed over time. The fundamental design has two separate looped blades with handles. These interlock to form a grasping instrument.

  • obstetrical phantom

    A life size model of a female pelvic region used to train medical students in child delivery.

  • obstetrical vectis

    A simple instrument resembling a single blade of an obstetric forceps. It is used during childbirth to assist the delivery of an obstructed foetus. Also known as ‘levers’.

  • obstetrics

    A branch of medicine dealing with the care of women. This care occurs during pregnancy, childbirth, and the period of recovery from childbirth.

  • occipital crochet

    Instrument used to measure the occipital bone at the back of the head.

  • octant

    Reflecting navigational instruments used for measuring the altitude of celestial bodies and having an arc of 1/8 of a circle, but due to their reflecting properties can measure up to 90 degrees; invented in the 1730s and used into the 19th century when superseded by sextants.

  • oesophagus

    The oesophagus connects the throat to the stomach. In humans and other vertebrates it is a muscular tube lined with mucous membrane.

  • oestrogen

    A female hormone. Oestrogen is first produced by a girl at puberty. It regulates the menstrual cycle and prepares the uterus for pregnancy. Oestrogen is present in males, but in very low levels.

  • oil bottle

    bottle for perfumed oil

  • oil dispenser

    A container used to carry oil and to apply it to any areas requiring lubrication.

  • oil feeder can

    A long thin container used to carry oil and for applying it to areas requiring lubrication where access is limited.

  • oil lamp

    Lamp designed to burn oil as fuel, typically with a reservoir for holding the oil and an opening from which a wick can be extended.

  • oil painting

    The art or practice of producing creative works in oil paint.

  • oil painting - visual work

    Creative work in the medium of oil paint.

  • oil tank wagon

    A railway vehicle dedicated to the carriage of fuel oil.

  • ointment pot

    Container for ointment - a smooth greasy healing preparation usually applied to the skin.

  • omnibus

    A long motor vehicle for passengers; a bus.

  • ophthalmic instrument

    An instrument used in eye surgery.

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