aplanatic

UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˌæpləˈnætɪk/US:USA pronunciation: respellingUSA pronunciation: respelling(ap′lə nat′ik)


WordReference Random House Unabridged Dictionary of American English © 2026
ap•la•nat•ic  (ap′lə nat′ik),USA pronunciation adj. [Optics.]
  1. Opticsfree from spherical aberration and coma.
  • a-6 + Greek planá(ein) to wander + -tic. See planet 1785–95
ap′la•nat′i•cal•ly, adv. 

Collins Concise English Dictionary © HarperCollins Publishers::
aplanatic / ˌæpləˈnætɪk/
  1. (of a lens or mirror) free from spherical aberration
Etymology: 18th Century: from Greek aplanētos prevented from wandering, from a-1 + planētos, from planaein to wander
'aplanatic' also found in these entries (note: many are not synonyms or translations):
aplanetic

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