From Longman Dictionary of Contemporary Englishfolk science/psychology/wisdom etcfolk science/psychology/wisdom etcRFscience etc that is based on the ideas or beliefs that ordinary people have, and does not involve a high level of technical knowledge → folk
Examples from the Corpus
folk science/psychology/wisdom etc• Some of the new findings, though, support previously unsubstantiated folk wisdom about alcohol and caffeine.• Maxims, proverbs, and other forms of folk wisdom give a person reasons for obeying rules.• Like most folk wisdom it is true, I think.• The folk wisdom led Tory politicians to dismiss opinion poll findings suggesting the opposite.• It was a part of folk wisdom that providing houseroom for a widowed parent could lead to intense family friction.• Like much political folk wisdom, this particular belief is of recent origin.• Voters' trade-off between taxes and services has changed since 1979 - and anyway the folk wisdom was always misleading. 