Aplanatic is a 9 letter English word. It's valid Words with friends word worth 17 points.
You can make 287 anagrams from letters in aplanatic (aaacilnpt).
1785-95; a-6 + Greek planá(ein) to wander + -tic. See planet
aplanatic triplets 64-68 can only be used on stands with rack and pinion adjustment.
A lens in which the spherical aberration is corrected is said to be aplanatic.
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