Real Dictionary

steroid in American English
any of a group of compounds including the sterols, bile acids, and sex hormones, characteristically having the carbon-atom ring structure of the sterols; specif., an anabolic steroid
adjective: pertaining to or characteristic of a steroid
noun: any of a large group of fat-soluble organic compounds, as the sterols, bile acids, and sex hormones, most of which have specific physiological action

steroid in British English
noun: any of a large group of fat-soluble organic compounds containing a characteristic chemical ring system. The majority, including the sterols, bile acids, many hormones, and the D vitamins, have important physiological action