Basic Guidelines For English Spellings
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Relating to faith or trust rather than to reason.
A person whose belief is based on faith.
Mid 17th century (in an earlier sense). From post-classical Latin pisticus, adjective designating nard (Vetus Latina, Vulgate) from Hellenistic Greek πιστικός (New Testament), perhaps ‘genuine, pure’, a sense of πιστικός faithful from ancient Greek πίστις faith + -ικός.