nostrum /nosˈtrəm/

1. Any secret, quack or patent medicine
2. Any favourite remedy or scheme

• extremist
• extremists
• extremities
• extremity
• extremophile
• extricable
• extricate
• extricated
• extricates
• extricating
• extrication
• extrications
• extrinsic
• extrinsical
• extrinsicalities
• extrinsicality
• extrinsically
• extrorsal
• extrorse
• extroversion
• extroversions
• extroversive
• extrovert
• extroverted
• extroverting