Steroid: a chemical that is produced in the body or made as a drug. Steroids can act as hormones or be used for treating conditions such as swelling, or, illegally, by athletes to improve their performance.

http://www.macmillandictionary.com/dictionary/british/steroid


Purging: From Purge, to remove people suddenly or violently from an organization, group etc.

http://www.macmillandictionary.com/dictionary/british/purge_1