Category: O

  • Ocular torticollis

    Torticollis from inequality in sight of the two eyes.  

  • Optical coherence tomography

    A radiographical method used to obtain high-resolution cross-sectional images of tissues and their defects, e.g., of the structures of the eye.  

  • Oral tolerance

    The suppression of autoimmune or allergic responses as a result of eating antigenic material.  

  • Osseous tissue

    Bone, a connective tissue with a matrix of calcium phosphate and calcium carbonate surrounding osteocytes.  

  • Occluding thrombus

    A thrombus that completely closes the vessel.    

  • Obstructing thrombus

    A thrombus completely occluding the lumen of a vessel.  

  • Oral temperature

    The temperature obtained by placing a thermometer under the patient’s tongue with lips closed for 3 min. It should not be taken for at least 10 min after ingestion of hot or cold liquids. It is not advisable for infants, individuals who breathe through the mouth, comatose or obtunded patients, or the critically ill.  

  • Oral syringe

    A syringe made of plastic or glass. It is not fitted with a needle but is graduated and is used to dispense liquid medication to children. The tip is constructed to prevent its breaking in the child’s mouth. An oral syringe may also be used to deliver fluids to impaired patients with an intact swallowing…

  • Occipitomastoid suture

    A suture between the occipital bone and the mastoid portion of the temporal bone. The occipitomastoid and lambdoid sutures meet at the asterion.  

  • Open suction

    Clearing the airways of a mechanically ventilated patient with a suction catheter inserted into the endotracheal tube after the patient has been disconnected from the ventilator circuit.