placebo

placebo — noun

1. a pill, injection, or other treatment that contains no real drug, given either t

1.nounC1
Definition

a pill, injection, or other treatment that contains no real drug, given either to a patient who believes it is genuine medicine or to one group in a study so that doctors can compare the results with people who took the actual drug.

Example

Half of Dr. Tanaka's volunteers took the new pain pill; the rest were given a placebo.

passive: be given a placebo in a clinical trial

The sugar tablets worked as a placebo and helped Marcus sleep through the night.

function as a placebo

Common collocations
  • receive a placebo
  • given a placebo
  • placebo group
  • placebo-controlled trial
Synonyms
  • sugar pill

    informal everyday term for the same idea, often used in news writing

  • dummy pill

    informal; common in clinical-trial reporting

  • control treatment

    technical term used in research design

Antonyms
  • active drug

    the real medicine that contains the working ingredient being tested

Grammar Patterns

a placebo of [substance]

given a placebo

Usage Note

Frequently appears with verbs like 'give', 'receive', 'take', 'prescribe', and 'compare against'. In medical writing the typical phrase is 'placebo-controlled trial', meaning a study where one group secretly takes a placebo.

Common Mistakes

The doctor gave me a placebo medicine for my headache, and it cured me right away.
The doctor gave me a placebo for my headache, and surprisingly it eased the pain.
'placebo' already means a fake medicine; saying 'placebo medicine' is repetitive.

2. something offered to calm or please someone after their real wish has been refus

2.nounC2
Definition

something offered to calm or please someone after their real wish has been refused, so the person feels looked after even though the underlying request has not been met.

Example

The free coffee was just a placebo for passengers whose flights had been cancelled.

a placebo for [disappointed group]

Critics said the small pay rise was a placebo, since nurses had asked for safer working hours.

X was a placebo (in place of real change)

Common collocations
  • just a placebo
  • merely a placebo
  • offered as a placebo
Synonyms
  • sop

    formal; a small concession given to silence complaints

  • token gesture

    neutral; emphasises smallness rather than dishonesty

  • consolation

    wider term — anything given to comfort someone who has lost out

Antonyms

Grammar Patterns

a placebo for [someone]

merely a placebo

Usage Note

Distinguish from sense 1: this figurative use is never about real medicine. The thing offered (a gift, a small concession, a promise) is real, but it is too small to satisfy the genuine need. Often modified by 'just', 'merely', or 'only' to underline that the gesture is not enough.

Common Mistakes

The boss gave us a placebo, so we were finally happy with our salaries.
The boss gave us a placebo of free snacks, but we still wanted higher pay.
sense 2 implies the gesture does NOT truly satisfy people; pairing it with full satisfaction is contradictory.

Word family

  • placebo effect
    nounC1
  • placebo-controlled
    adjectiveC2

Synonym discussion

Sense: noun/1

All four refer to a treatment given without the active drug, but they differ in register and precision. 'Placebo' is the standard medical term and is the only one that travels comfortably from research papers into newspapers and everyday speech. 'Sugar pill' and 'dummy pill' are informal nicknames that journalists use to make a study easier to picture; doctors rarely use them in formal writing. 'Control treatment' is broader — it covers any reference treatment used for comparison, including a placebo but also an older drug. So in a clinical-trial report you would write 'patients in the placebo group', in a magazine article 'volunteers were given a sugar pill', and in a study design section 'the control treatment was a saline injection'.

placebo ↗sugar pilldummy pillcontrol treatment

Common collocations

Nouns

  • placebo effect
  • placebo group
  • placebo arm
  • placebo response
  • placebo pill

Phrases

  • placebo-controlled trial
  • double-blind placebo study
  • given as a placebo

Prepositions

  • against a placebo
  • on a placebo
  • with a placebo

Etymology

LatinMedieval LatinMiddle EnglishEnglish

Borrowed directly from Latin 'placebo', meaning 'I shall please', the first-person future form of 'placere' (to please). In medieval Christian funeral services, the opening words of the evening prayer for the dead were 'Placebo Domino' ('I shall please the Lord'), and the whole service came to be called a 'placebo'. By the late 1700s English doctors had borrowed the word for any harmless treatment given more to please or calm a patient than to cure them. The modern research sense — a control pill in a drug trial — became standard in the twentieth century.