Definition of "nonplanar" [nonplanar]

• Not planar (adjective)

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• "Don Ramsay's laboratory, where I discovered a singlet-singlet electronic transition of the NCN radical and worked on pyridine which turned out to have a nonplanar excited state (still to be fully published!), I transferred to Cec Costain's laboratory because I had developed a fascination for microwave spectroscopy."
• "We show that Inv allows to design in particular 3-noncrossing nonplanar RNA pseudoknot 3-noncrossing RNA structures - a class which is difficult to construct via dynamic programming routines."