achromat
noun
ach·ro·mat ˈa-krə-ˌmat 
: achromatic lens
Word History
Etymology
probably borrowed from German Achromat, short for achromatische Linse "achromatic lens"
First Known Use
1900, in the meaning defined above
Medical Definition
achromat
noun
ach·ro·mat ˈak-rə-ˌmat
: achromatic lens