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dewar has 2 distinct synonyms spread across 2 of its 2 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
vacuum flask that holds liquid air or helium for scientific experiments
Scottish chemist and physicist noted for his work in cryogenics and his invention of the Dewar flask (1842-1923)
Synonyms, antonyms and the broader and narrower relations for dewar come from Princeton University’s WordNet. Full sources and licences.