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cadmium
[U] Uncountable
This term is primarily used in scientific, industrial, and environmental contexts. It carries a heavy association with toxicity and pollution, often appearing in reports about hazardous waste or soil contamination. In a technical sense, it is recognized for its ability to absorb neutrons, making it indispensable in nuclear reactor control rods. This creates a stark contrast between its role as a dangerous pollutant and its utility in high-tech engineering.
Used exclusively as a mass noun to describe the chemical element or the metal substance.