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Optics.

free from color.
able to emit, transmit, or receive light without separating it into colors.

Biology. (of a cell structure) difficult to stain.
Music. without accidentals or changes in key.
Historical Examples

achromatic lenses are used in all high-grade optical instruments such as telescopes and microscopes.
Physics Willis Eugene Tower

If not, the substitution of an achromatic lens will be of no advantage.
Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 Various

The achromatic condenser itself should consist of at least two combinations of different powers and of wide angular apertures.
Photography in the Studio and in the Field Edward M. Estabrooke

Given the achromatic object-glass, why should not it be divided?
Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 Various

The bands are then achromatic in the sense that the ordinary telescope is so.
Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 6 Various

The achromatic doublets have a very large, clear and flat field.
Microscopes and Accessory Apparatus Ernst Leitz

John Dollond died; an eminent English optician and inventor of the achromatic telescope.
The Every Day Book of History and Chronology Joel Munsell

achromatic and other lenses were known, and the microscope, the telescope and spectacles.
Inventions in the Century William Henry Doolittle

This object-glass is under corrected in point of colour, and wants to be made longer in the focus to be achromatic.
Quarterly Journal of Science, Literature and the Arts, July-December, 1827 Various

Fourthly, there is the contrast of colour and neutrality, the chromatic and achromatic, or hue and shade.
Field’s Chromatography George Field

adjective
without colour
capable of reflecting or refracting light without chromatic aberration
(cytology)

not staining with standard dyes
of or relating to achromatin

(music)

involving no sharps or flats
another word for diatonic

denoting a person who is an achromat
adj.

1766, from Greek akhromatos “colorless,” from a-, privative prefix (see a- (3)), + khromat-, comb. form of khroma “color” (see chroma) + -ic.

achromatic ach·ro·mat·ic (āk’rə-māt’ĭk)
adj.

Of or relating to color perceived to have zero saturation and therefore no hue, such as neutral grays, white, or black.

Refracting light without spectral color separation.

Of or relating to cells or tissues difficult to stain with standard dyes.

achromatic
(āk’rə-māt’ĭk)
Designating color perceived to have zero saturation and therefore no hue, such as neutral grays, white, or black.