This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A patient who is admitted to a hospital or clinic for treatment that does not require an overnight stay.

adj. Provided without requiring an overnight stay by the patient.

n. A patient who receives treatment at a hospital or clinic but is not admitted overnight; a receiver of ambulatory care.

"After your child completes the program, our team will see him in outpatient clinic to insure that his progress continues."

inpatient   

patient   

pre-operative    reparative    immunisation    electroconvulsive    noncriminal