Informal abbreviation of laboratory: a room or building equipped for scientific experiments, research, or teaching, or for the manufacture of drugs or chemicals.

The chemistry students spent the afternoon conducting experiments in the lab.

A short form for Labrador Retriever, a breed of dog.

Their family adopted a friendly lab from the animal shelter.

A class or period of instruction that takes place in a laboratory setting.

My chemistry lab starts at 2 p.m. every Thursday.

labverb

To experiment with or practise something intensively in order to understand it better or improve performance.

He spent the evening labbing new combos in the fighting game.

labadjektiv

Relating to or used in a laboratory.

She put on her lab coat before entering the clean room.

Relating to the Labrador Retriever breed of dog.

They adopted a lab puppy from the shelter.