Registrar comes from Medieval Latin registrarius ('keeper of a register'), from registrum ('register, list'), an alteration of Late Latin regesta ('list, matters recorded'), from regerere ('to record, carry back'), from re- ('back') + gerere ('to carry, bear'). The historical chain includes Latin registrum, Latin regerere, and Latin gerere. Older glosses in the chain include "keeper of a register", "register, list", "list, matters recorded", and "to record, carry back", which help explain the semantic range of the modern word. Morphologically, registrar is best read as compound and borrowing, yielding an English noun shaped by both form history and later usage. In current English it functions as a noun, with the sense "an official who keeps official records or registers". English derivatives include registrarship; related forms include register, registry, and registration. The result is an English noun whose etymology preserves the older forms while supporting the word's specialized modern meaning.