1. principal main or most important
  2. principle a basic generalization that is accepted as true
  3. pernicious exceedingly harmful
  4. Principe an island in the Gulf of Guinea that is part of Sao Tome and Principe
  5. principally for the most part
  6. Principen semisynthetic penicillin
  7. precipice a very steep cliff
  8. princess a female member of a royal family other than the queen
  9. principality territory ruled by a prince
  10. Progne subis large North American martin of which the male is blue-black
  11. principled based on or demonstrating morality or rightness
  12. prognosis a prediction of the course of a disease
  13. principal sum capital as contrasted with the income derived from it
  14. Prunus padus small European cherry tree closely resembling the American chokecherry
  15. principal axis a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted
  16. Prunus besseyi dwarf ornamental shrub of western United States having large black to red and yellow sweet edible fruit
  17. princewood tropical American timber tree
  18. princely having the rank of or befitting a prince
  19. prince a male member of a royal family other than the sovereign
  20. principalship the post of principal