a domestic or tamed animal kept for companionship or pleasure

the pony was a family pet

a pet cat

stroke or pat (an animal) affectionately

the cats came to be petted

a fit of sulking or ill humour

Mother's in a pet

a synthetic resin made by copolymerizing ethylene glycol and terephthalic acid, widely used to make polyester fibres

polyethylene terephthalate

positron emission tomography, a form of tomography used especially for brain scans