(Puritan) a member of a group of English Protestants of the late 16th and 17th centuries who regarded the Reformation of the Church under Elizabeth I as incomplete and sought to simplify and regulate forms of worship.
a person with censorious moral beliefs, especially about self-indulgence and sex:my mother was a puritan about sexdon’t be such a puritan
(usually Puritan) relating to the Puritans:a Puritan parliamentarianhe was of Puritan stock
having or displaying censorious moral beliefs, especially about self-indulgence and sex:as the puritan ethic has weakened, hedonism has replaced ita puritan conscience
late 16th century: from late Latin puritas 'purity' + -an
puritan in other Oxford dictionaries
Definition of puritan in the US English dictionary