Relating to or lying in a single geometric plane; flat or two-dimensional. Used in mathematics, engineering, and science to describe flat surfaces.
From Latin 'planum' meaning flat surface or level ground, with the suffix '-ar' meaning 'relating to'. The mathematical usage developed in the 19th century as geometry became more formalized.
In chemistry, planar molecules like benzene have all their atoms in the same flat plane, which gives them special stability and unique properties. This concept is crucial for understanding why some molecules are more reactive than others.
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