| orthoscopic | <optics> Giving an image in correct or normal proportions; giving a flat field of view; as, an orthoscopic eyepiece. Source: Websters Dictionary (01 Mar 1998) |
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| orthoscopic lens | A spectacle lens corrected for distortion and curvature of the periphery. (05 Mar 2000) |
| orthoscopic observation | <microscopy> The normal way of viewing an object microscopically (cf., conoscopic observation). With Kohler illumination the field diaphragm and the ocular front focal plane as well as the specimen will be in simultaneous focus. (05 Aug 1998) |
| orthoscopic spectacles | Convex lenses with base-in prisms for close work. (05 Mar 2000) |
| orthosilicic | <chemistry> Designating the form of silicic acid having the normal or highest number of hydroxyl groups. Origin: Ortho- + silicic. Source: Websters Dictionary (01 Mar 1998) |
| orthosis | An external orthopaedic appliance, as a brace or splint, that prevents or assists movement of the spine or the limbs. Origin: G. Orthosis, a making straight (05 Mar 2000) |
| orthospermous | <botany> Having the seeds straight, as in the fruits of some umbelliferous plants; opposed to coelospermous. Origin: Ortho- + Gr. Seed. Source: Websters Dictionary (01 Mar 1998) |
| orthostatic | <anatomy> Pertaining to or caused by standing erect. Origin: Gr. Statikos = causing to stand (18 Nov 1997) |
| orthostatic albuminuria | 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 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) |
| 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) |