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1) having only one nucleus <a \mononuclear cell>
2) MONOCYCLIC
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mono·nu·cle·ar (mon″o-nooґkle-ər) [mono- + nuclear] 1. having but one nucleus; called also mononucleate and uninuclear. 2. a cell having a single nucleus, especially a monocyte of the blood or tissues.Medical dictionary. 2011.