physics

(noun) the science of matter and energy and their interactions. Synonyms: natural philosophy. Example: "His favorite subject was physics."

(noun) the physical properties, phenomena, and laws of something. Synonyms: physical science. Example: "He studied the physics of radiation."

(noun) a purging medicine; stimulates evacuation of the bowels. Synonyms: purgative, cathartic, physic, aperient.