subdeacon
noun
sub·dea·con ˌsəb-ˈdē-kən 
: a cleric ranking below a deacon: such as
a
: a cleric in the lowest of the former major orders of the Roman Catholic Church
b
: an Eastern Orthodox or Armenian cleric in minor orders
c
: a clergyman performing the liturgical duties of a subdeacon
Word History
Etymology
Middle English subdecon, from Anglo-French subdiakene, from Late Latin subdiaconus, from Latin sub- + Late Latin diaconus deacon — more at deacon
First Known Use
before the 12th century, in the meaning defined above