| orthostatic hypopiesis | <cardiology> The manifestation of low blood pressure when rising from a chair or bed. A drop in blood pressure that is precipitated by changes in body position. May be related to hydration status, drug side effect or be caused by a dysfunction in the autonomic nervous systems ability to maintain blood pressure with positional changes (for example autonomic neuropathy secondary to diabetes). (27 Sep 1997) |
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| orthostatic hypotension | <cardiology> The manifestation of low blood pressure when rising from a chair or bed. A drop in blood pressure that is precipitated by changes in body position. May be related to hydration status, drug side effect or be caused by a dysfunction in the autonomic nervous systems ability to maintain blood pressure with positional changes (for example autonomic neuropathy secondary to diabetes). (27 Sep 1997) |
| orthostatic proteinuria | The appearance of albumin in the urine when the patient is erect and its disappearance when recumbent. Synonym: orthostatic proteinuria, postural proteinuria, postural albuminuria. (05 Mar 2000) |
| orthostatic tachycardia | Increased heart rate on assuming the erect posture. (05 Mar 2000) |
| orthostereoscope | <instrument> A rarely used instrument for viewing stereoscopic radiographs. (05 Mar 2000) |
| orthostichy | Origin: Ortho- + Gr. Row. <botany> A longitudinal rank, or row, of leaves along a stem. Source: Websters Dictionary (01 Mar 1998) |
| orthosympathetic | Referring to the sympathetic component of the autonomic nervous system, as distinguished from parasympathetic. See: autonomic nervous system. (05 Mar 2000) |
| orthotic devices | Apparatus used to support, align, prevent, or correct deformities or to improve the function of movable parts of the body. (12 Dec 1998) |
| orthotics | The science concerned with the making and fitting of orthopaedic appliances. Synonym: orthetics. (05 Mar 2000) |
| orthotist | A maker and fitter of orthopaedic appliances. (05 Mar 2000) |
| orthotolidine | O-Tolidine; 3,3'-dimethylbenzidine;in the presence of peroxidase, orthotolidine (like benzidine) is oxidised to a blue colour; since haemoglobin behaves like a peroxidase, orthotolidine has been used as an in vitro aid for the detection of occult blood in faeces. (05 Mar 2000) |
| orthotomic | <geometry> Cutting at right angles. <geometry> Orthotomic circle, that circle which cuts three given circles at right angles. Origin: Ortho- + Gr. To cleave. Source: Websters Dictionary (01 Mar 1998) |
| orthotomous | <chemistry> Having two cleavages at right angles with one another. Source: Websters Dictionary (01 Mar 1998) |
| orthotomy | <geometry> The property of cutting at right angles. Source: Websters Dictionary (01 Mar 1998) |
| orthotonos | Orthotonus A form of tetanic spasm in which the neck, limbs, and body are held fixed in a straight line. Origin: ortho-+ G. Tonos, tension (05 Mar 2000) |