compound /ˈkɒmpaʊnd/ noun [C]
MIXTURE › a substance that is a combination of two or more elements: Water is a compound of hydrogen and oxygen.
AREA › an area of land with a group of buildings surrounded by a fence or wall: a prison compound
GRAMMAR (also compound noun/verb/adjective) › a noun, verb, or adjective that is made by two or more words used together. For example, 'golf club' is a compound.