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[foh-tuh-kroh-mik] /ˌfoʊ təˈkroʊ mɪk/

(of chemically treated glass or plastic) capable of darkening or changing color when exposed to light.
(of glass) changing colour with the intensity of incident light, used, for example, in sunglasses that darken as the sunlight becomes brighter


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  • Photochromy

    [foh-tuh-kroh-mee] /ˈfoʊ təˌkroʊ mi/ noun 1. a former technique of color photography.

  • Photochronograph

    [foh-tuh-kron-uh-graf, -grahf] /ˌfoʊ təˈkrɒn əˌgræf, -ˌgrɑf/ noun 1. a device formerly used for taking a series of instantaneous photographs of a rapidly moving object. 2. a picture taken by such a device. 3. a in which the tracing or record is made by a pencil of light on a sensitized surface. 4. an instrument for […]

  • Photocoagulation

    [foh-toh-koh-ag-yuh-ley-shuh n] /ˌfoʊ toʊ koʊˌæg yəˈleɪ ʃən/ noun 1. a surgical technique using an intense beam of light from a laser or a xenon-arc bulb to seal blood vessels or coagulate tissue, used primarily in ophthalmology to repair detached retinas or to treat certain kinds of retinopathy. photocoagulation pho·to·co·ag·u·la·tion (fō’tō-kō-āg’yə-lā’shən) n. Surgical coagulation of tissue […]

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