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