1. Recurring at regular intervals. 2. Denoting a disease with regularly recurring exacerbations or paroxysms. 3. Denoting any of several oxoacids of iodine.
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pe·ri·od·ic .pir-ē-'äd-ik adj occurring or recurring at regular intervals <\periodic epidemics>
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pe·ri·od·ic (pērґe-odґik) 1. recurring at regular intervals of time. 2. recurring intermittently or occasionally.Medical dictionary. 2011.