sectary

noun, plural sec·ta·ries.

1. a member of a particular sect, especially an adherent of a religious body regarded as heretical or schismatic.
2. a Protestant of nonconformist denomination, especially a minor one.
3. a person zealously devoted to a particular sect.

noun plural -taries

1. a member of a sect, esp a person who belongs to a religious sect that is regarded as heretical or schismatic
2. a person excessively devoted to a particular sect
3. a member of a Nonconformist denomination, esp one that is small

n.“member or adherent of a sect,” 1550s, from French sectaire or directly from Medieval Latin sectarius, from secta (see sect).