1. a workplace for the conduct of scientific research
2. a region resembling a laboratory inasmuch as it offers opportunities for observation and practice and experimentation
the new nation is a testing ground for socioeconomic theories|Pakistan is a laboratory for studying the use of American troops to combat terrorism
3. The workroom of a chemist; also, a place devoted to experiments in any branch of natural science; as, a chemical, physical, or biological laboratory. Hence, by extension, a place where something is prepared, or some operation is performed; as, the liver is the laboratory of the bile.