Surrounding a focus; denoting tissues, or the blood that they contain, in the vicinity of an infective focus.
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peri·fo·cal .per-ə-'fō-kəl adj of, relating to, occurring in, or being the tissues surrounding a focus (as of infection) <\perifocal proliferation of fibroblasts>
peri·fo·cal·ly -ē adv
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peri·fo·cal (per″ĭ-foґkəl) around or surrounding a focus, such as a focus of infection.Medical dictionary. 2011.