† postcommunicantadj.AnatomyObsoleterare designating either of a pair of arteries (the posterior communicating arteries) that run backward from the internal carotid arteries into the posterior cerebral arteries.
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1885 B. G. Wilder in Jrnl. Nerv. & Mental Dis.12 349 [Common Latin name] Communicans posterior..[English paronym] Postcommunicant.