free from spherical aberration and coma.
A lens in which the spherical aberration is corrected is said to be aplanatic.
An Elementary Text-book of the Microscope John William Griffith
aplanatic triplets 64-68 can only be used on stands with rack and pinion adjustment.
Microscopes and Accessory Apparatus Ernst Leitz
(of a lens or mirror) free from spherical aberration
aplanatic ap·la·nat·ic (āp’lə-nāt’ĭk)
Of or relating to an optical lens that is free from chromatic or spherical aberration.
a nonmotile gamete.
having no motility. adjective (esp of some algal and fungal spores) nonmotile or lacking a motile stage
(in certain algae and fungi) a nonmotile, asexual spore formed within a cell, the wall of which is distinct from that of the parent cell. noun a nonmotile asexual spore produced by certain algae and fungi
defective development or congenital absence of a limb, organ, or other body part. noun (pathol) congenital absence or abnormal development of an organ or part n. 1885, medical Latin, from Greek a-, privative prefix (see a- (3)), + -plasia. aplasia a·pla·si·a (ə-plā’zē-ə, -zhə) n. Congenital absence of an organ or tissue. Incomplete, retarded, or defective […]