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it means flat or plane; often used to describe eyeglasses or optical lense blanks that do not contain a curvature; e.g. for sunglasses or fashion eyewear they are non-perscription and non-corrective for vision defects: plano sunglasses;for telescopes mirrors they are flat blanks that are not yet ground into their parabolic shape.

It originates by combining the Latin words plānus (level) and plānum (level ground).

A secondary use of the word can be used to represent "movement," "moving," "capable of movement"; e.g. planogamete. This comes from the Greek plános (wandering, roaming).

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14y ago

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