Noun:
1: pet a domesticated animal kept for companionship or amusement
2: favorite, dearie, darling, favourite, ducky, pet, deary a special loved one
3: pet a fit of petulance or sulkiness (especially at what is felt to be a slight)
4: pet, positron emission tomography using a computerized radiographic technique to examine the metabolic activity in various tissues (especially in the brain)
Verb:
1: pet stroke or caress gently; "pet the lamb"
2: pet stroke or caress in an erotic manner, as during lovemaking
Adjective:
1: loved, pet, favourite, best-loved, preferred, favored, preferent, favorite preferred above all others and treated with partiality; "the favored child"