Initialism of Port Republic, New Jersey. / Abbreviation of Paraná. A state of Brazil. / Initialism of Puerto Rico. A territory of the United States.

Initialism of public relations. / Initialism of proportional representation. / Initialism of permanent residence. / Initialism of police report. / Initialism of personal representative.

(medicine) Initialism of per rectal or per rectum.

(chemistry) Abbreviation of propyl.

(pharmacology) a shortened allomorph of the monoclonal antibody affix -pro-, used for ease of pronunciation before all source affixes but -xi- and -zu-

(lexicography) Abbreviation of Provençal (the language).

(UK military) Abbreviation of pounder.

plural of PR

Initialism of pervasive refusal syndrome. / Initialism of President of the Royal Society. / Initialism of Pierre Robin sequence or syndrome.

Abbreviation of Prayer of Manasseh.