23-letter words containing p, e, i, g
- transplantation antigen — a histocompatibility antigen identified by its effect on the rejection of transplanted cells or tissues.
- triple expansion engine — (formerly) a steam engine in which the steam is expanded in three stages in cylinders of increasing diameter to accommodate the increasing volume of the steam
- voyageurs national park — a national park in N Minnesota. 343 sq. mi. (888 sq. km).