a person who is under medical care or treatment.

a person or thing that undergoes some action.

Archaic . a sufferer or victim.

bearing provocation, annoyance, misfortune, delay, hardship, pain, etc., with fortitude and calm and without complaint, anger, or the like.

characterized by or expressing such a quality

a patient smile.

quietly and steadily persevering or diligent, esp. in detail or exactness

a patient worker.

undergoing the action of another ( opposed to agent ). ?

patient of

having or showing the capacity for endurance

a man patient of distractions.

susceptible of

This statement is patient of criticism.