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

Derived Forms

• ˌaplaˈnatically, adverb

Other Words From

• apla·nati·cal·ly adverb

Word History and Origins

Origin of aplanatic¹

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

Word History and Origins

Origin of aplanatic¹

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

Example Sentences

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

From Project Gutenberg

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

From Project Gutenberg