aplanatic

[ ap-luh-nat-ik ]

adjectiveOptics.

free from spherical aberration and coma.

Origin of aplanatic

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

Other words from aplanatic

ap·la·nat·i·cal·ly, adverb

Words Nearby aplanatic

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use aplanatic in a sentence

A lens in which the spherical aberration is corrected is said to be aplanatic.
An Elementary Text-book of the Microscope | John William Griffith
aplanatic triplets 64-68 can only be used on stands with rack and pinion adjustment.
Microscopes and Accessory Apparatus | Ernst Leitz

British Dictionary definitions for aplanatic

aplanatic

/ (ˌæpləˈnætɪk) /

adjective

(of a lens or mirror) free from spherical aberration

Origin of aplanatic

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

Derived forms of aplanatic

aplanatically, adverb

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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