Emily Dickinson Lexicon
Definition for A-PLA-NAT'IC
A-PLA-NAT'IC, a. [Gr. α neg. and πλαναω, to wander.]
An aplanatic telescope is one which entirely corrects the aberration of the rays of light. It is thus distinguished from the achromatic, which only partially corrects the aberration. – Ed. Encyc.
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