1) Achromous 2) Colorless 3) Having no color 4) Uncolored 5) Uncoloured 6) Without coloring matter 
• (a.) Free from color; colorless; as, in Physiol. Chem., the achromic point of a starch solution acted upon by an amylolytic enzyme is the point at which it fails to give any color with iodine.
Colourless. ... (05 Mar 2000) ... 
A·chro'mic adjective [ Greek ... colorless; ... priv. + ... color.] Free from color; colorless; as, in Physiol. Chem. , the achromic point of a starch solution acted upon by an amylolytic enzyme is the point at which it fails to give any color with iodine. 
Type: Term Pronunciation: ă-krō′mik Definitions: 1. Colorless.
[adj] - having no color
achromatic, achromic 1. Without color; colorless; unpigmented. 2. White, gray, or black in appearance. 3. Transmitting light without any constituent color separation; such as, a lens.
achromous adjective having no color
colorless; without coloring matter.