achromatic
adjective
[ ˌakrə(ʊ)ˈmatɪk ]
• relating to, using, or denoting lenses that transmit light without separating it into constituent colours.
• "achromatic microscopes"
• without colour.
• "the achromatic gloom"
Origin:
late 18th century: via French from Greek a- ‘without’ + khrōmatikos (from khrōma ‘colour’).
