placebo

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pla|cebo /pləs'iːboʊ/ (placebos)
[N-COUNT]
A placebo is a substance with no effects that a doctor gives to a patient instead of a drug. Placebos are used when testing new drugs or sometimes when a patient has imagined their illness.pla|cebo ef|fect (placebo effects)
[N-COUNT] usu the N in sing
The placebo effect is the fact that some patients' health improves after taking what they believe is an effective drug but which is in fact only a placebo.

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ablaze

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allowance

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