Achromatism

Achromatism, transmission of light, undecomposed and free from colour, by means of a combination of dissimilar lenses of crown and flint glass, or by a single glass carefully prepared.

Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)

Achit`ophel * Acierage
Ach`eron
Ach`ery
Ach`ill
Achille`id
Achil`les
Achilles of Germany
Achilles tendon
Achmed Pasha
Ach`met I.
Achit`ophel
Achromatism
Acierage
A`ci-Rea`lë
A`cis
Ack`ermann, R.
Acland, Sir Henry
Aclinic Line
Acne
Acœmetæ
Aconca`gua
Aconite