| 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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| 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) |
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| snowball opacity | A spherical, white body seen in the vitreous in asteroid hyalosis. (05 Mar 2000) |
| 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) |