Definition of myth-information in US English:

myth-information

noun

North American
  • Information which is widely held to be true but which is in fact flawed or unsubstantiated; common knowledge based on hearsay rather than fact.

Origin

1960s; earliest use found in Science. From myth + information, probably punningly after misinformation.

Pronunciation

myth-information

/ˌmɪθɪnfəˈmeɪʃn/