Misconception (noun)

1. A wrong or inaccurate idea or understanding about something.
2. A false belief or notion that is firmly held in spite of evidence to the contrary.

Origin:

The word 'misconception' originated in the late 16th century and comes from the old french word 'mesconcepcion' which meant 'false notion' or 'misunderstanding.' it is a combination of the prefix 'mis-' (meaning 'wrong') and the word 'conception' (meaning 'idea' or 'understanding').

Examples:

1. There is a common misconception that all snakes are dangerous.
2. Many people have a misconception that eating only protein will help them lose weight.
3. The author tried to clear up some of the misconceptions about the ancient civilization in his book.
4. The public's misconception about mental illness causes a great deal of suffering and discrimination.
5. She realized that her misconception about the company's policies was preventing her from making the right decision.