aplanatic

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To compute exactly the extent to which these evils have been developed he has devised a syncretic abacus, in which, on the principle of the spectroscope, the aplanatic foci are arranged in fluorescent nodules each equidistant from the metacentre.

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Definitions (5)

Toggle American Heritage definitions American Heritage Dictionary (1)

  1. adjective Of or relating to optical systems that correct for spherical aberration.

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Etymologies (2)

Toggle American Heritage etymologies American Heritage Dictionary (1)

  1. From a-1 + Greek planāsthai, to wander; see pelə-2 in Indo-European roots.

Toggle Century etymologies Century Dictionary (1)

  1. Prop. aplanetic, from Greek ἀπλάνητος, not wandering, from - privative + πλανητός, wandering: see planet.
 

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/æpləˈnætɪk/
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