Lacking color; colorless or transparent, especially when referring to substances or minerals.
From Greek 'a-' (without) + 'chroma' (color) + '-ous' (adjective suffix). A direct adjectival form of the 'achro-' prefix family, used in mineralogy and chemistry.
Achroous is the chemistry way of saying 'clear as glass'—used when scientists need to emphasize that something is genuinely colorless and transparent, not just faintly colored or slightly opaque.
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