a patient who receives treatment at a hospital, as in an emergency room or clinic, but is not hospitalized.
Also, out-patient.

1705–15; out- + patient

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World English Dictionary
outpatient (ˈaʊtˌpeɪʃənt)
Compare inpatient a nonresident hospital patient

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1715 (n.) "person who is treated at a hospital but not admitted," from out + patient (q.v.). The adj. is first recorded 1879.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

outpatient out·pa·tient (out'pā'shənt)
A patient who is admitted to a hospital or clinic for treatment that does not require an overnight stay.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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