superphosphate /soo- or sū-pər-fosˈfāt/

1. An acid phosphate
2. A mixture of calcium sulphate and calcium acid phosphate chiefly used as a fertilizer

• optic
• Optic
• optical
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• optical character reader
• optical character readers
• optical character recognition
• optical computing
• optical disk
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• optical-electronic device
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• optical fibre
• optical fibres
• optical illusion
• optical illusions
• optically
• optical maser
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• optical microscope
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• optical splitter