a room or building with special equipment where scientists, engineers, or medical workers carry out tests, research, or experiments
Mia carefully measured the solution before placing it in the lab oven.
The new microscope arrived, and the whole lab gathered to try it out.
✦ Shortened form of “laboratory,” first recorded in the late 1800s.
a class period at school or university in which students perform practical experiments, usually held in a laboratory
We have biology lab on Wednesday afternoon.
During chemistry lab, we learned how to titrate acids and bases.
✦ From “laboratory” in the sense of a practical science class; popularized in U.S. universities in the early 20th century.
informal short form of “Labrador Retriever,” a large, friendly dog bred to retrieve game, now a popular family pet and service dog
The black lab wagged her tail and greeted everyone at the door.
Sam takes his lab to the park every morning for a long run.
✦ Clipped form of “Labrador Retriever,” first attested mid-20th century in North America.
