placebo

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. an innocuous or inert medication;
given as a pacifier or to the control group in experiments on the efficacy of a drug
• Hypernyms:
medicine, medication, medicament, medicinal drug
• Hyponyms:
active placebo
2. (Roman Catholic Church) vespers of the office for the dead
• Topics:
Roman Catholic, Western Church, Roman Catholic Church, Church of Rome, Roman Church
• Hypernyms:
vesper