an environment, typically used in manufacturing or scientific research, in which environmental contaminants are kept to an absolute minimum
clean room in American English
US
any of various environments, as a room, designed to produce and maintain an atmosphere almost 100% free of contaminants such as dust, pollen, or bacteria: used in the assembly of spacecraft, in hospitals, etc.
Examples of 'clean room' in a sentence
clean room
Pushing past a twisted wall brace, he entered a section of the plant that had been used as a clean room.
Dale Brown and Jim DeFelice DALE BROWN'S DREAMLAND (5) STRIKE ZONE (2004)