- prophylaxisThe prevention of, or the protective treatment for, disease.
- prolactinA peptide gonadotrophic hormone secreted by the pituitary gland; it stimulates growth of the mammary glands and lactation in females.
- pro-agreeing with; supporting; favouring
- prophyllThe frequently specialised or reduced leaf produced at the first node of a new shoot.
- prothalamionA song or poem in honour of a bride and bridegroom about to be married.