Lacking color, colorless, or without the normal pigmentation found in similar organisms or structures.
From Greek 'achromatos' (without color) + the English adjectival suffix '-ous.' This straightforward English adjective directly translates the Greek concept into a descriptor for anything lacking color or pigmentation.
The '-ous' suffix here is Latin-based, not Greek—showing how English medical language beautifully blends Greek and Latin roots, which actually happened because of how medicine developed across different European cultures!
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