Pectoral
An agent which relieves chest conditions in the bronchio-pulmonary area.
 

Peristalsis
The wavelike alternate contraction and relaxation of the walls of a tubular structure by means of which its contents are moved onward characteristic of the GI tract.
 

Phlegm
Abnormal amounts of thick mucus especially from the respiratory tract.
 

Precursor
A substance which starts a chain reaction which initiates growth of a more active or mature substance.
 

Prophylactic
Any agent or regimen that contributes to the prevention of infection, condition or disease.
 

Prostaglandin
A substance that has a variety of hormonelike actions including acting as chemical messenger and causing uterine contractions.
 

Pungent
Penetrating or sharp to the taste, also called bite.
 

Purgative
Causes watery evacuation of intestinal contents and near-incontinent conditions.
 

Putrefaction
Decomposition of organic matter, especially proteins, by the action of anaerobic microorganisms, resulting in the formation of amines such as putrescine and cadaverine, which have a putrid odor.