1. A lack of transparency; an opaque or nontransparent area. 2. On a radiograph, a more transparent area is interpreted as an o. to x-rays in the body. 3. Mental dullness. [L. opacitas, shadiness]
- nodular o. a solitary, round, circumscribed shadow found in the lung on chest radiograph; causes include granuloma, primary or metastatic carcinoma, benign tumor, vascular malformation. SYN: coin lesion of lungs.
- snowball o. a spherical, white body seen in the vitreous in asteroid hyalosis.

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opac·i·ty ō-'pas-ət-ē n, pl -ties
1) the quality or state of a body that makes it impervious to the rays of light broadly the relative capacity of matter to obstruct by absorption or reflection the transmission of radiant energy (as X-rays, infrared radiation, or sound)
2) an opaque spot in a normally transparent structure (as the lens of the eye)

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opac·i·ty (o-pasґĭ-te) [L. opacitas] 1. the condition of being opaque. 2. an opaque spot or area. See also cataract.

Medical dictionary. 2011.

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