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apneusis
apneustic breathing
apnoea
APO
apo-
apoapsis
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Apocalypse
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aplanatic

ap·la·nat·ic [ àpplə náttik ]


adjective 
Definition:
 
without spherical aberration: describes a lens that does not have, or is corrected for, spherical aberration and so produces a clear undistorted image

[Late 18th century. < Greek aplanētos "without error" < planasthai "wander"]
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