形容詞 aplanatic:

1. free from or corrected for spherical aberration

ap.la.nat.ic

adj.（形容詞）
Of or relating to optical systems that correct for spherical aberration.
等光程的，透鏡消球差的：矯正球面像差的光學系統(tǒng)或與之有關的

來源：
From a-
源自 a-
Greek planasthai [to wander] * see pel…- 2
希臘語 planasthai [漫步] *參見 pel…- 2