1. principal sum capital as contrasted with the income derived from it
  2. principalship the post of principal
  3. principality territory ruled by a prince
  4. principally for the most part
  5. principal axis a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted
  6. principal main or most important
  7. provincialism a lack of sophistication
  8. principled based on or demonstrating morality or rightness
  9. principle a basic generalization that is accepted as true
  10. prince's-plume annual with broadly ovate leaves and slender drooping spikes of crimson flowers; southeastern Asia and Australia; naturalized in North America
  11. Peronospora hyoscyami fungus causing a downy mildew on growing tobacco
  12. protoplasm the substance of a living cell
  13. piroplasm minute parasite of red blood cells of mammals transmitted by a tick and causing diseases of domestic animals
  14. orange balsam North American annual plant with usually yellow or orange flowers; grows chiefly on wet rather acid soil
  15. Peruvian balsam tree of South and Central America yielding an aromatic balsam
  16. Prince of Wales the male heir apparent of the British sovereign
  17. Prunus padus small European cherry tree closely resembling the American chokecherry
  18. probabilism (philosophy) the doctrine that (since certainty is unattainable) probability is a sufficient basis for belief and action
  19. Prince Albert prince consort of Queen Victoria of England (1819-1861)
  20. Prince-of-Wales plume New Zealand with pinnate fronds and a densely woolly stalks

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