"pseudodisks" meaning in English

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          "ref": "2016, Minati De, Abhiruk Lahiri, “Geometric Dominating Set and Set Cover via Local Search”, in arXiv:",
          "text": "On the other hand, the same technique leads to a PTAS for geometric covering problem when the objects are convex pseudodisks (which includes disks, unit height rectangles, homothetic convex objects etc.).",
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          "ref": "2016, Minati De, Abhiruk Lahiri, “Geometric Dominating Set and Set Cover via Local Search”, in arXiv:",
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