IPA: //ˈaʊtˌpeɪʃənt//
KK: /ˈaʊtˌpeɪʃənt/
A person who receives medical treatment at a hospital or clinic but does not stay overnight.
The outpatient received treatment for his injury and went home the same day.
Outpatient → It is formed from "out-" (meaning outside) and "patient" (from Latin "pati", meaning to suffer or endure). The term "outpatient" refers to a patient who receives medical treatment without being admitted to a hospital, thus remaining outside of it.
Think of someone who is 'outside' ('out-') the hospital while still receiving care, which is what an outpatient does.