baptist (n.)

c. 1200, "one who baptizes," also (with capital B-) a title of John, the forerunner of Christ; see baptize + -ist. As "member of a Protestant sect that believes in adult baptism upon profession of faith," generally by full immersion (with capital B-), attested from 1654; their opponents called them anabaptists (see Anabaptist).

Others are reading

Definitions of baptist from WordNet

Baptist (n.)
follower of Baptistic doctrines;