An officer who has the custody or keeping of a registry or register. This word is used in England; “register” is more common in America. Registrar general. In English law. An officer appointed by the crown under the great seal, to whom, subject to such regulations as shall be made by a principal secretary of state, the general superintendence of the whole system of registration of births, deaths, and marriages is intrusted. 8 Steph. Comm. 234.