Nonplane

Non`plane´


a.1.(Math.) Not lying in one plane; not planar; - said of certain curves.
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However, these numerical methods are not adequate if two areas of the same nonplane surface (example: sag-deformation sheet) exchange energy by radiation.
We have this nonplane wave that hits the deformable mirror, but by the time it bounces off, it's a plane wave again," says Acton.