Select the most appropriate one-word substitution for the given group of words.

A remedy for all diseases 

Panacea

The most appropriate one-word substitution for "a remedy for all diseases" is panacea.

• Nausea is a feeling of sickness in the stomach that may cause vomiting.
• Nostalgia is a feeling of longing for the past.
• Elixir is a medicine or potion that is believed to have magical or medicinal powers.

The word panacea comes from the Greek word "panakeia," meaning "all-healing." A panacea is a cure-all, a remedy that is believed to be effective for all diseases. The word is often used to describe something that is too good to be true, or that is not actually effective.