Polymerase chain reaction (PCR) in molecular biology is a technique to amplify a single or few copies of a piece of DNA across several orders of magnitude, generating thousands to millions of copies of a particular DNA sequence.
Other meanings are :-

Pcr, Phosphocreatine
P. Craig Russell, an artist
Palestinian Center for Rapprochement between Peoples based in Beit Sahour
the Communist Party of Runion (Parti Communiste Runionnais)
the Romanian Communist Party (Partidul Communist Romn)
Passive radar, a radar system exploiting broadcast transmitters
Passport Carrier Release, the name of the operating system that runs on Nortel Multiservice switches in carrier configurations ...more