Real Dictionary

laboratory
countable noun: A laboratory in a school, college, or university is a room containing scientific equipment where students are taught science subjects such as chemistry.
countable noun: A laboratory is a building or a room where scientific experiments, analyses, and research are carried out.

laboratory in American English
a room, building, etc. for scientific experimentation or research
of or performed in, or as in, a laboratory
adjective: serving a function in a laboratory
noun: a building, part of a building, or other place equipped to conduct scientific experiments, tests, investigations, etc., or to manufacture chemicals, medicines, or the like

laboratory in British English
noun: a building or room equipped for conducting scientific research or for teaching practical science