HyperDic: principal_axis

English > 1 sense of the expression principal axis:
NOUNcognitionprincipal axis, optic axisa line that passes through the center of curvature of a lens so that light is neither reflected nor refracted
English > principal axis: 1 sense > noun 1, cognition
MeaningA line that passes through the center of curvature of a lens so that light is neither reflected nor refracted.
Synonymoptic axis
BroaderaxisA straight line through a body or figure that satisfies certain conditions

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