placebo – a substance with no chemical effects given to a patient instead of a drug
(Pronounced pluh-see-boh)
To remember the definition of the word placebo, use the following mnemonic:
It was a plus to see the effects of both (placebo). The doctor gave the two patients a pill but one had no chemical effect.

Examples of placebo in a sentence
Because I was given a placebo during the drug test, my medical condition did not improve.
The doctor prescribed a placebo to his patient who had imaginary illnesses.
As a test subject, Pete may receive either the manufacturer’s new drug or a placebo containing no active components.