aplanatic

[ap-luh-nat-ik]

ap·la·nat·ic

[ap-luh-nat-ik]
adjective Optics.
free from spherical aberration and coma.

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

ap·la·nat·i·cal·ly, adverb
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Aplanatic is always a great word to know.
So is callithumpian. Does it mean:
the offspring of a zebra and a donkey.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Collins
World English Dictionary
aplanatic (ˌæpləˈnætɪk)
 
adj
(of a lens or mirror) free from spherical aberration
 
[C18: from Greek aplanētos prevented from wandering, from a-1 + planētos, from planaein to wander]
 
apla'natically
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

aplanatic ap·la·nat·ic (āp'lə-nāt'ĭk)
adj.
Of or relating to an optical lens that is free from chromatic or spherical aberration.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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