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aplanatic

[ ap-luh-nat-ik ]

adjective

, Optics.
  1. free from spherical aberration and coma.

aplanatic

/ ˌæpləˈnætɪk /

adjective

  1. (of a lens or mirror) free from spherical aberration
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Derived Forms

  • ˌaplaˈnatically, adverb
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Other Words From

  • apla·nati·cal·ly adverb
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Word History and Origins

Origin of aplanatic1

1785–95; a- 6 + Greek planá ( ein ) to wander + -tic. See planet
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Word History and Origins

Origin of aplanatic1

C18: from Greek aplanētos prevented from wandering, from a- 1+ planētos, from planaein to wander
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Example Sentences

A lens in which the spherical aberration is corrected is said to be aplanatic.

Aplanatic triplets 64-68 can only be used on stands with rack and pinion adjustment.

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