PEI

An injection of ethanol (alcohol) through the skin directly into a tumor to kill cancer cells. Ultrasound or a CT scan is used to guide the needle into the tumor. Also called alcohol ablation, ethanol ablation, and percutaneous ethanol injection.
Found on http://www.cancer.gov/dictionary?expand=P

Pei

Pei, Mario The Story of the English Language, J.B. Lippincott Company, New York, 1967.
Found on http://www.wordinfo.info/words/index/info/view_unit/4224/

Pei

Pei, river, China: see Bei.
Found on http://www.infoplease.com/ce6/world/A0917289.html

pei

see percutaneous ethanol injection.
Found on http://www.encyclo.co.uk/local/22225
No exact match found