/ ˌredʒɪˈstrɑː(r); NAmE ; ˈredʒɪstrɑː(r)/ noun
1.
a person whose job is to keep official records, especially of births, marriages and deaths
2.
the senior officer who organizes the affairs of a college or university
3.
a doctor working in a British hospital who is training to become a specialist in a particular area of medicine :
a paediatric registrar
—compare consultant , resident
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WORD ORIGIN
late 17th cent.: from medieval Latin registrarius , from registrum , alteration of regestum , singular of late Latin regesta things recorded, from regerere enter, record.