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nocebo Syllabification: no·ce·bo
Pronunciation: /nəˈsēbō/

Definition of nocebo in English:

noun (plural nocebos)

A detrimental effect on health produced by psychological or psychosomatic factors such as negative expectations of treatment or prognosis.
Example sentences
  • Because of ethical concerns, nocebos are not commonly used in medical practice or research.
  • Section Four, ‘Essays and Commentaries,’ examines aromatherapy and essential oils and homeopathy, the placebo effect, and herbs as a token and nocebos.
  • It is also worth noting that the placebo has a negative counterpart - called a nocebo.


1960s: from Latin, literally 'I shall cause harm', from nocere, 'to harm', on the pattern of placebo.

Definition of nocebo in:
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