PET definition

(1) Preferred above all others and treated with partiality

"The favored child"

(2) Using a computerized radiographic technique to examine the metabolic activity in various tissues (especially in the brain)

(3) A domesticated animal kept for companionship or amusement

(4) A fit of petulance or sulkiness (especially at what is felt to be a slight)

(5) A special loved one

(6) Stroke or caress in an erotic manner, as during lovemaking

(7) Stroke or caress gently

"Pet the lamb"