syllabub or (rare) sillabub /silˈə-bub/

1. A dish of cream curdled (eg with wine), flavoured and frothed up
2. Anything frothy or insubstantial

• positive poles
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• positivism
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• positron emission tomography
• positron emission tomography scanner
• positron emission tomography scanners
• positronium
• positroniums
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• posits