| CO | carbon monoxide; cardiac output; castor oil; casualty officer; centric occlusion; cervical orthosis;... |
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| HIPO | hemihypertrophy, intestinal web, preauricular skin tag, and congenital corneal opacity [syndrome]; H... |
| IOU | intensive care observation unit; international opacity unit |
| Opa | Opacity |
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| OF | Opacity factor |
| snowball opacity | A spherical, white body seen in the vitreous in asteroid hyalosis. (05 Mar 2000) |
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| snowball | 1. A round mass of snow pressed or roller together, or anything resembling such a mass. 2. <botany> The Guelder-rose. Snowball tree. (11 Mar 1998) |
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| snowball sampling | A method whereby interview subjects for a statistical study are obtained from subjects already interviewed for that study.This technique is most often used with target populations made up of elusive or uncooperative subjects (e.g., IV drug users). Those subjects first contacted are asked to name acquaintances, who are then approached, interviewed, and asked for additional names. In this way, a sufficient number of subjects can be accumulated to give a study adequate power. (05 Mar 2000) |
| corneal opacity | Clouding that can occur in the cornea secondary to inflammation, infection or irritant exposure (foreign body or chemical). Physicians can visualize the corneal for the presence of opacities using the slit lamp (eye scope). (27 Sep 1997) |
| nodular opacity | A solitary, round, circumscribed shadow found in the lung on chest radiograph; causes include granuloma, primary or metastatic carcinoma, benign tumour, vascular malformation. Synonym: coin lesion of lungs. (05 Mar 2000) |
| opacity | The degree to which smoke or particles emitted into the air reduce the transmission of light and obscure the view of an object in the background. (05 Dec 1998) |
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