1) Patient 
A patient who visits a health care facility for diagnosis or treatment without spending the night. Sometimes called a day patient.
a person who receives treatment and who does not need to stay overnight; the term can also be applied to the facility itself (such as outpatient clinic)
A patient who is not an inpatient (not hospitalised). Outpatient care is called ambulatory care. ... (12 Dec 1998) ... 
(out´pa-shәnt) a patient who comes to the hospital, clinic, or dispensary for diagnosis or treatment but is not admitted for an overnight stay.
(OP) Type: Term Pronunciation: owt′pā′shent Definitions: 1. A patient treated in a hospital dispensary or clinic instead of in an overnight room or ward.
Outpatient: A patient who is not an inpatient (not hospitalized) but instead is cared for elsewhere -- as in a doctor's office, clinic, or day surgery center. The term outpatient dates back at least to 1715. Outpatient care today is also called ambulatory care.
a patient who is receiving ambulatory care at a hospital or other facility without being admitted to the facility. 
[n] - a patient who does not reside in the hospital where he is being treated
A patient who attends hospital for treatment, consultation and advice but does not require a stay in hospital.
A patient who attends the hospital for an appointment or treatment without staying overnight.
noun a patient who does not reside in the hospital where he is being treated
A person who receives medical treatment without admittance to a hospital for 24 hours or more.
a patient who receives treatment at a hospital, as in an emergency room or clinic, but is not hospitalized.