13-Letter Words Containing: P,E,T,Y

• to believe especially on uncertain or tentative grounds

• the branch of psychiatry concerned with psychological methods

• the treatment of mental or emotional problems by psychological means

• surgical interruption of a nerve pathway in the sympathetic nervous system

• extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds

• a chemical substance obtained from plants that is biologically active but not nutritive