pei

/P EY1/
noun
  1. 1

    A surname.

  2. 2

    Initialism of Prince Edward Island: a province of Canada. [A province in eastern Canada. Capital: Charlottetown.]

  3. 3

    Initialism of pancreatic exocrine insufficiency.

  4. 4

    Abbreviation of polyethyleneimine. [A polymer of ethyleneimine, often mixed with acrylamides]