pet -- (a fit of petulance or sulkiness (especially at what is felt to be a slight))
positron emission tomography, PET -- (using a computerized radiographic technique to examine the metabolic activity in various tissues (especially in the brain))
Overview of verb pet
The verb pet has 2 senses
pet -- (stroke or caress gently; "pet the lamb")
pet -- (stroke or caress in an erotic manner, as during lovemaking)