S: (n) pet (a fit of petulance or sulkiness (especially at what is felt to be a slight))
S: (n) positron emission tomography, PET (using a computerized radiographic technique to examine the metabolic activity in various tissues (especially in the brain))
Verb
S: (v) pet (stroke or caress gently) "pet the lamb"
S: (v) pet (stroke or caress in an erotic manner, as during lovemaking)