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Pronunciation varies by accent · adjective
(physics) Of a temperature close to absolute zero, especially one at which quantum-mechanical properties are observed..
Use ultracold when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Ultracold means (physics) Of a temperature close to absolute zero, especially one at which quantum-mechanical properties are observed..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use ultracold where its definition matches the intended context.
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